WO1997045008A1 - Tablet heating device for the vaporization of active materials - Google Patents

Tablet heating device for the vaporization of active materials Download PDF

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Publication number
WO1997045008A1
WO1997045008A1 PCT/ES1997/000132 ES9700132W WO9745008A1 WO 1997045008 A1 WO1997045008 A1 WO 1997045008A1 ES 9700132 W ES9700132 W ES 9700132W WO 9745008 A1 WO9745008 A1 WO 9745008A1
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WO
WIPO (PCT)
Prior art keywords
housing
electrodes
tablet
vaporization
active materials
Prior art date
Application number
PCT/ES1997/000132
Other languages
Spanish (es)
French (fr)
Inventor
Jordi BASAGAÑAS MILLAN
Original Assignee
DBK ESPAñA, S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DBK ESPAñA, S.A. filed Critical DBK ESPAñA, S.A.
Publication of WO1997045008A1 publication Critical patent/WO1997045008A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00—Stationary means for catching or killing insects
    • A01M1/20—Poisoning, narcotising, or burning insects
    • A01M1/2022—Poisoning or narcotising insects by vaporising an insecticide
    • A01M1/2061—Poisoning or narcotising insects by vaporising an insecticide using a heat source
    • A01M1/2077—Poisoning or narcotising insects by vaporising an insecticide using a heat source using an electrical resistance as heat source
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/015—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone
    • A61L9/02—Disinfection, sterilisation or deodorisation of air using gaseous or vaporous substances, e.g. ozone using substances evaporated in the air by heating or combustion
    • A61L9/03—Apparatus therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/10—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heater elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic

Definitions

  • the invention relates to a heating device for tablets impregnated with active materials, to achieve their vaporization and their corresponding use as an air freshener or as an insect-killing medium.
  • the device uses as a heating medium a PTC semiconductor tablet, known by these acronyms for being positive temperature coefficient tablets, in which the resistance increases exponentially with the temperature until it reaches the previously established, not allowing more current to pass through.
  • a PTC semiconductor tablet known by these acronyms for being positive temperature coefficient tablets, in which the resistance increases exponentially with the temperature until it reaches the previously established, not allowing more current to pass through.
  • the type of devices referred to They comprise two electrodes with their corresponding connection pins, as well as a concentric conduit through which the wick that is impregnated with the liquid that is intended to be vaporized is disposed, being among the aforementioned electrodes the heating pad itself, using as a transmitter housing of the ceramic material heat, so that this being a poor thermal conductor the heating of the pellet corresponding to the heat transmission is not efficient enough, that is to say that the consumption of active matter is not regular.
  • the device that is recommended has been designed to solve this problem to full satisfaction, based on a simple and effective solution, since it uses PTC tablets as heating element, and is intended to heat tablets impregnated with liquid active materials.
  • the device has the peculiarity that between the electrodes and the heat conducting material, determined by an aluminum plate or sheet, an insulating sheet of small thickness is provided, all mounted on a housing that can be materialized in plastic material.
  • the heating of the tablet is guaranteed in a completely homogeneous way, along its entire surface.
  • housing-support of the aluminum plate is materialized in plastic, preferably in polyamide, contrary to what occurs in known systems or devices where the support-housing of the thermally conductive material is ceramic.
  • the heating device will have a longer duration, by virtue of the aforementioned characteristics, that is to say the housing being constructed in plastic and in being aluminum the thermal material used.
  • the device includes the aforementioned plastic housing, with a prolonged central hole in a neck, as well as with means of positioning and retention by interlocking of the aluminum plate itself, being superimposed on the sheet of insulating material, covering the two electrodes between which the heating semiconductor tablet itself is located, with its corresponding connection terminals that are passed through windows or grooves provided at the bottom of the housing itself.
  • Figure 1 shows a representation corresponding to an exploded view of the different components or parts that constitute the tablet heating device made in accordance with the object of the invention.
  • Figure 2. Shows a side view, according to a longitudinal section, of the device of the invention.
  • Figure 3. Shows a top plan view of the same heating device represented in the previous figures.
  • the device of the invention is constituted from a general housing (1) with a rectangular contour, affected by longitudinal windows, while centrally it is provided with a hole (2) that extends into a neck (3) of considerable length, projected downwards as shown in Figure 2, the hole (2) being made in a circular recess (4) in which the circular electrode (5) is positioned with elastic pins (6) and a lateral extension (7) constituting the corresponding connecting pin, the latter being through a groove (8) provided in the bottom of the housing (1).
  • a second slot (9) is provided for the passage of the pin (10) corresponding to the second electrode (11), this being of rectangular configuration with a small lateral fin (12) that fits into the recess (13), all of which being perfectly positioned the electrodes (5) and (11) referred to and among them the heating semiconductor tablet itself.
  • the insulating paper sheet (15) is located on the electrode (11), and on it the aluminum plate (16), being perfectly embedded in the upper part of the housing (1), by retaining it by means of nails (17) provided for this purpose in corresponding elastic pins that the housing has at the ends of its side walls (18).
  • the general structure of the device is simple and practical, since the housing is made of plastic, and the electrodes (5) and (11), and among them the heating pad (14), are perfectly positioned in the general housing (1) and covered the whole assembly by means of the aluminum plate (16), with the interposition of the sheet of insulating paper (15), which makes the device effective in its function, which is that heating the tablet (14) entails the vaporization of active substances contained in tablets.

Abstract

The device comprises a PTC semiconductor pellet (14) for heating tablets impregnated with active materials which, when vaporized, may be used as ambient enhancing agents or as insect killing components. The device comprises a plastic casing (1) with a central orifice (2) and a slot (4) for positioning the semiconductor pellet (14) which remains interleaved between two electrodes (5 and 11) provided with the corresponding connection fingers (7 and 12) passing through grooves (8 and 9) of a casing (1), the assembly being completed by an aluminium plate (16) and interpositioning an isolating paper sheet (15); the plate (16) and consequently the other components remain secured inside the casing (1) by locking the latter by means of pawls of the casing (1).

Description

DISPOSITIVO CALEFACTOR DE TABLETAS PARA LΑ VAPORIZACIÓNTABLET HEATING DEVICE FOR LΑ VAPORIZATION
DE MATERIAS ACTIVASOF ACTIVE MATTERS
D E S C R I P C I Ó ND E S C R I P C I Ó N
OBJETO DE LA INVENCIÓNOBJECT OF THE INVENTION
La invención se refiere a un dispositivo de calentamiento de tabletas impregnadas de materias activas, para conseguir la vaporización de éstas y su correspondiente utilización como medio ambientador o como medio mata-insectos.The invention relates to a heating device for tablets impregnated with active materials, to achieve their vaporization and their corresponding use as an air freshener or as an insect-killing medium.
El dispositivo utiliza como medio de calentamiento una pastilla semiconductora PTC, conocidas con dichas siglas por ser pastillas de coeficiente de temperatura positivo, en las que la resistencia aumenta exponencialmente con la temperatura hasta que llega a la previamente establecida, no dejando pasar más corriente.The device uses as a heating medium a PTC semiconductor tablet, known by these acronyms for being positive temperature coefficient tablets, in which the resistance increases exponentially with the temperature until it reaches the previously established, not allowing more current to pass through.
ANTECEDENTES DE LA INVENCIÓNBACKGROUND OF THE INVENTION
Son numerosos los dispositivos y medios que se conocen para la vaporización de determinadas materias activas, utilizadas como mata-insectos, como ambientadores, etc. , pudiendo citar aquellos descritos en los modelos de utilidad españoles 9203290 y 9300256, así como en la patente europea con número de publicación 0290159, de manera que los dispositivos descritos en dichos documentos están previstos para calentar productos líquidos contenidos en un pequeño depósito que a través de una mecha alcanzan la zona de calentamiento, para producir la vaporización correspondiente.There are numerous devices and means that are known for the vaporization of certain active materials, used as insect killers, as air fresheners, etc. , citing those described in Spanish utility models 9203290 and 9300256, as well as in the European patent with publication number 0290159, so that the devices described in said documents are intended to heat liquid products contained in a small tank that through of a wick they reach the heating zone, to produce the corresponding vaporization.
Por otro lado, el tipo de dispositivos referido comprenden dos electrodos con sus correspondientes patillas de conexión, así como un conducto concéntrico a través del cual se dispone la mecha que se impregna del líquido que se pretende vaporizar, quedando entre los aludidos electrodos la pastilla de calentamiento propiamente dicha, utilizando como carcasa transmisora del calor material cerámico, de modo que siendo éste un deficiente conductor térmico el calentamiento de la pastilla correspondiente a la transmisión del calor no es lo suficientemente eficaz, es decir que el consumo de materia activa no es regular.On the other hand, the type of devices referred to They comprise two electrodes with their corresponding connection pins, as well as a concentric conduit through which the wick that is impregnated with the liquid that is intended to be vaporized is disposed, being among the aforementioned electrodes the heating pad itself, using as a transmitter housing of the ceramic material heat, so that this being a poor thermal conductor the heating of the pellet corresponding to the heat transmission is not efficient enough, that is to say that the consumption of active matter is not regular.
DESCRIPCIÓN DE LA INVENCIÓNDESCRIPTION OF THE INVENTION
El dispositivo que se preconiza ha sido concebido para resolver esa problemática a plena satisfacción, en base a una solución sencilla y eficaz, ya que utiliza como elemento calefactor pastillas PTC, y está previsto para calentar tabletas impregnadas de materias activas líquidas.The device that is recommended has been designed to solve this problem to full satisfaction, based on a simple and effective solution, since it uses PTC tablets as heating element, and is intended to heat tablets impregnated with liquid active materials.
Además, el dispositivo presenta la particularidad de que entre los electrodos y el material conductor del calor, determinado éste por una placa o lámina de aluminio, se ha previsto una lámina aislante de escaso grosor, todo ello montado sobre una carcasa que puede estar materialiada en material plástico.In addition, the device has the peculiarity that between the electrodes and the heat conducting material, determined by an aluminum plate or sheet, an insulating sheet of small thickness is provided, all mounted on a housing that can be materialized in plastic material.
Dadas estas características, y en base a utilizar como elemento conductor térmico una placa de aluminio, el calentamiento de la pastilla queda garantizado de manera totalmente homogénea, a lo largo de toda su superficie.Given these characteristics, and based on the use of an aluminum plate as a thermal conductor, the heating of the tablet is guaranteed in a completely homogeneous way, along its entire surface.
Además, y como característica fundamental cabe destacar el hecho de que la estructura del dispositivo y materiales utilizados en el mismo permiten una temperatura de funcionamiento más baja que la conseguida habitualmente, del orden de los 10°C inferior a la de los dispositivos convencionales, de modo que al trabajar con temperaturas más bajas las ventajas derivadas son evidentes, pudiéndose citar como más importantes las siguientes:In addition, and as a fundamental feature, the fact that the structure of the device and materials used in it allow a lower operating temperature than usually achieved, of the order of 10 ° C lower than that of conventional devices, so that when working with lower temperatures the advantages derived are evident, and can be cited as most important the following:
Conseguir que la carcasa-soporte de la placa de aluminio esté materializada en plástico, preferentemente en poliamida, en contra de lo que ocurre en los sistemas o dispositivos conocidos donde la carcasa-soporte del material conductor térmico es de cerámica.To ensure that the housing-support of the aluminum plate is materialized in plastic, preferably in polyamide, contrary to what occurs in known systems or devices where the support-housing of the thermally conductive material is ceramic.
Asimismo, el dispositivo calefactor tendrá una mayor duración, en virtud de las características anteriormente mencionadas, es decir el estar la carcasa construida en plástico y en ser aluminio el material térmico utilizado.Likewise, the heating device will have a longer duration, by virtue of the aforementioned characteristics, that is to say the housing being constructed in plastic and in being aluminum the thermal material used.
En lo que a estructura se refiere, el dispositivo incluye la ya comentada carcasa de plástico, con un orificio central prolongado en un cuello, así como con medios de posicionado y retención por enclavamiento de la propia placa de aluminio, quedando superpuesta a la lámina de material aislante, cubriendo ésta los dos electrodos entre los que queda situada la pastilla semiconductora de calentamiento propiamente dicha, con sus correspondientes terminales de conexión que son pasantes a través de ventanas o ranuras previstas en el fondo de la propia carcasa.As far as structure is concerned, the device includes the aforementioned plastic housing, with a prolonged central hole in a neck, as well as with means of positioning and retention by interlocking of the aluminum plate itself, being superimposed on the sheet of insulating material, covering the two electrodes between which the heating semiconductor tablet itself is located, with its corresponding connection terminals that are passed through windows or grooves provided at the bottom of the housing itself.
DESCRIPCIÓN DE LOS DIBUJOSDESCRIPTION OF THE DRAWINGS
Para complementar la descripción que se está realizando y con objeto de ayudar a una mejor comprensión de las características del invento, se acompaña a la presente memoria descriptiva, como parte integrante de la misma, un juego de dibujos en donde con carácter ilustra- tivo y no limitativo, se ha representado lo siguiente:To complement the description that is being realizing and in order to help a better understanding of the features of the invention, a set of drawings is attached hereto as an integral part thereof, with illustrative and non-limiting character, what has been represented next:
La figura 1.- Muestra una representación correspondiente a una vista en explosión de los distintos componentes o partes que constituyen el dispositivo calefactor de tabletas realizado de acuerdo con el objeto de la invención.Figure 1 shows a representation corresponding to an exploded view of the different components or parts that constitute the tablet heating device made in accordance with the object of the invention.
La figura 2.- Muestra una vista lateral, según una sección longitudinal, del dispositivo de la invención.Figure 2.- Shows a side view, according to a longitudinal section, of the device of the invention.
La figura 3.- Muestra una vista en planta superior del mismo dispositivo calefactor representado en las figuras anteriores.Figure 3.- Shows a top plan view of the same heating device represented in the previous figures.
REALIZACIÓN PREFERENTE DE LA INVENCIÓNPREFERRED EMBODIMENT OF THE INVENTION
Como puede verse en las figuras referidas el dispositivo de la invención se constituye a partir de una carcasa general (1) con un contorno rectangular, afectada de ventanas longitudinales, mientras que centralmente está dotada de un orificio (2) que se prolonga en un cuello (3) de considerable longitud, proyectado hacia abajo como se representa en la figura 2, estando el orificio (2) realizado en un rebaje circular (4) en el que se posiciona el electrodo circular (5) con patillas elásticas (6) y una prolongación lateral (7) constitutiva de la correspondiente patilla de conexión, siendo ésta pasante a través de una ranura (8) prevista en el fondo de la carcasa (1) . En oposición a la ranura (8) se ha previsto una segunda ranura (9) para el paso de la patilla (10) correspondiente al segundo electrodo (11) , siendo éste de configuración rectangular con una pequeña aleta lateral (12) que encaja en el cajeado (13) , todo ello quedando perfectamente posicionados los electrodos (5) y (11) referidos y entre ellos la pastilla semiconductora de calentamiento propiamente dicha. Las patillas de conexión (7) y (10) de los electrodos (5) y (11) , a través de las ventanas (8) y (9) , emergen hacia abajo, quedando situadas paralelamente al cuello (3) anteriormente referido.As can be seen in the aforementioned figures, the device of the invention is constituted from a general housing (1) with a rectangular contour, affected by longitudinal windows, while centrally it is provided with a hole (2) that extends into a neck (3) of considerable length, projected downwards as shown in Figure 2, the hole (2) being made in a circular recess (4) in which the circular electrode (5) is positioned with elastic pins (6) and a lateral extension (7) constituting the corresponding connecting pin, the latter being through a groove (8) provided in the bottom of the housing (1). In opposition to the slot (8) a second slot (9) is provided for the passage of the pin (10) corresponding to the second electrode (11), this being of rectangular configuration with a small lateral fin (12) that fits into the recess (13), all of which being perfectly positioned the electrodes (5) and (11) referred to and among them the heating semiconductor tablet itself. The connecting pins (7) and (10) of the electrodes (5) and (11), through the windows (8) and (9), emerge downwards, being located parallel to the neck (3) referred to above.
Sobre el electrodo (11) queda situada la lámina de papel aislante (15) , y sobre ella la placa de aluminio (16) , quedando ésta perfectamente enclavada en la parte superior de la carcasa (1) , por retención de la misma mediante uñas (17) previstas al efecto en correspondientes patillas elásticas con que cuenta la carcasa en los extremos de sus paredes laterales (18) .The insulating paper sheet (15) is located on the electrode (11), and on it the aluminum plate (16), being perfectly embedded in the upper part of the housing (1), by retaining it by means of nails (17) provided for this purpose in corresponding elastic pins that the housing has at the ends of its side walls (18).
Como se habrá podido comprobar, la estructura general del dispositivo resulta sencilla y práctica, ya que la carcasa es de plástico, y los electrodos (5) y (11) , y entre ellos la pastilla de calentamiento (14) , quedan perfectamente posicionados en la carcasa general (1) y cubierto todo el conjunto mediante la placa de aluminio (16) , con la interposición de la lámina de papel aislante (15) , lo que hace que el dispositivo sea eficaz en su función, cual es la de que el calentamiento de la pastilla (14) lleva consigo la vaporización de materias activas contenidas en tabletas.As you can see, the general structure of the device is simple and practical, since the housing is made of plastic, and the electrodes (5) and (11), and among them the heating pad (14), are perfectly positioned in the general housing (1) and covered the whole assembly by means of the aluminum plate (16), with the interposition of the sheet of insulating paper (15), which makes the device effective in its function, which is that heating the tablet (14) entails the vaporization of active substances contained in tablets.
No se considera necesario hacer más extensa esta descripción para que cualquier experto en la materia comprenda el alcance de la invención y las ventajas que de la misma se derivan. Los materiales, forma, tamaño y disposición de los elementos serán susceptibles de variación siempre y cuando ello no suponga una alteración en la esencialidad del invento.It is not considered necessary to make this description more extensive so that any person skilled in the art understands the scope of the invention and the advantages derived therefrom. The materials, shape, size and arrangement of the elements will be subject to variation as long as this does not imply an alteration in the essentiality of the invention.
Los términos en que se ha redactado esta memoria deberán ser tomados siempre en sentido amplio y no limitativo. The terms in which this report has been written must always be taken in a broad and non-limiting sense.

Claims

R E I V I N D I C A C I O N E SR E I V I N D I C A C I O N E S
1§.- Dispositivo calefactor de tabletas para la vaporización de materias activas, que utilizando como medio de calentamiento un elemento semiconductor debidamente montado en una carcasa general (1) en la que se han previsto además una pareja de electrodos (5) y (11) con sus correspondientes patillas de conexión (7) y (10) , esencialmente se caracteriza porque el elemento semiconductor está constituido por una pastilla semiconductora (14) tipo PTC intercalada entre los electrodos (5) y (11) , efectuándose la transferencia de calor a la respectiva tableta a través de una placa de aluminio (16) montada sobre la propia carcasa (1), con carácter desmontable, y con la interposición de una lámina de papel aislante (15).1§.- Tablet heating device for the vaporization of active materials, which using a semiconductor element properly mounted in a general housing (1) in which a pair of electrodes (5) and (11) are also provided ) with its corresponding connecting pins (7) and (10), it is essentially characterized in that the semiconductor element is constituted by a semiconductor tablet (14) type PTC inserted between the electrodes (5) and (11), the heat transfer being carried out to the respective tablet through an aluminum plate (16) mounted on the housing itself (1), removable, and with the interposition of an insulating paper sheet (15).
2a.- Dispositivo calefactor de tabletas para la vaporización de materias activas, según reivindicación la, caracterizado porque la carcasa (1) es de material plástico y en su zona central está provista de un cajeado (4) de ubicación para la pastilla semiconductora (14) tipo PTC intercalada entre los dos electrodos (5) y (11) , determinando un conjunto que queda retenido por la propia placa de aluminio (16) montada sobre la parte superior de la carcasa (1) , entre sus paredes laterales (18) , placa2a.- Tablet heating device for the vaporization of active materials, according to claim la, characterized in that the housing (1) is made of plastic material and in its central area it is provided with a recess (4) for the location of the semiconductor tablet (14). ) PTC type sandwiched between the two electrodes (5) and (11), determining an assembly that is retained by the aluminum plate itself (16) mounted on the upper part of the housing (1), between its side walls (18) , license plate
(16) que queda retenida mediante unas uñas de anclaje(16) that is retained by anchoring nails
(17) previstas en correspondientes patillas elásticas que forman parte de dichas paredes laterales (18); con la particularidad de que los electrodos (5) y (11) cuentan con respectivas patillas elásticas (6) y (12) , la primera de ellas anclada en un cajeado (13) de la carcasa (1) , en tanto que las respectivas patillas de conexión (7) y (10) de tales electrodos (5) y (11) son pasantes a través de respectivas ranuras (8) y (9) con que al efecto cuenta el fondo de la propia carcasa (1) (17) provided on corresponding elastic pins that are part of said side walls (18); with the particularity that the electrodes (5) and (11) have respective elastic pins (6) and (12), the first one anchored in a recess (13) of the housing (1), while the respective connecting pins (7) and (10) of such electrodes (5) and (11) are passed through respective slots (8) and (9) with which the bottom of the housing itself (1)
PCT/ES1997/000132 1996-05-30 1997-05-27 Tablet heating device for the vaporization of active materials WO1997045008A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES9601197A ES2114495B1 (en) 1996-05-30 1996-05-30 TABLET HEATING DEVICE FOR THE VAPORIZATION OF ACTIVE SUBSTANCES.
ESP9601197 1996-05-30

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WO1997045008A1 true WO1997045008A1 (en) 1997-12-04

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CO (1) CO4650153A1 (en)
DE (1) DE19722724A1 (en)
ES (1) ES2114495B1 (en)
IT (1) IT1289953B1 (en)
PT (1) PT102011A (en)
WO (1) WO1997045008A1 (en)

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US7288748B1 (en) 2006-12-21 2007-10-30 S.C. Johnson & Son, Inc. PTC electrical heating devices
US8232509B2 (en) 2006-11-16 2012-07-31 S.C. Johnson & Son, Inc. Retainer system
US8406616B2 (en) 2007-06-29 2013-03-26 Zobele Holding Spa Tablet and device for the evaporation of volatile substances

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CN109984119B (en) * 2019-04-10 2021-07-09 王梓帆 Electric mosquito killer capable of automatically dismounting and mounting mosquito repellent incense and using method thereof

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US8232509B2 (en) 2006-11-16 2012-07-31 S.C. Johnson & Son, Inc. Retainer system
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US8406616B2 (en) 2007-06-29 2013-03-26 Zobele Holding Spa Tablet and device for the evaporation of volatile substances

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ES2114495A1 (en) 1998-05-16
ITMI970381A1 (en) 1998-08-21
IT1289953B1 (en) 1998-10-19
DE19722724A1 (en) 1997-12-04
CO4650153A1 (en) 1998-09-03
PT102011A (en) 1997-12-31
ES2114495B1 (en) 1999-02-01

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