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Publication numberUS1201519 A
Publication typeGrant
Publication date17 Oct 1916
Filing date20 Jun 1916
Priority date20 Jun 1916
Publication numberUS 1201519 A, US 1201519A, US-A-1201519, US1201519 A, US1201519A
InventorsArvid C Sorensen
Original AssigneeArvid C Sorensen
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1201519 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Patented Oct. 17, 1916.


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Specification of Letters Patent.

Patented 0a. 17,1916.

Application filed June 20, 1-916. Serial N0. 104,691.

To all whom it may concern:

Be it known that I, ARvIo G. SonENsEN, a citizen of the United States, residing at \Vebster, in the county of Ramsey, State of North Dakota, have invented a new and useful Safety-Envelop; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a safety envelop, and has for its object to provide a device of this character which embodies novel features of construction whereby after once being sealed it can not be opened without detection.

Further objects of the invention are to provide a safety envelop which can be manufactured at substantially the same cost as the ordinary envelop, which can be sealed and used in the same manner as an ordinary envelop, and which can not be opened by the use of steam or moisture without detection.

WVith these and other objects in view, the invention consists in certain novel combinations and arrangements of the parts as will more fully appear as the description pro ceeds, the novel features thereof being pointed out in the appended claim.

For a full understanding of the invention, reference is to be had to the following description and accompanying drawings, in which Figure 1 is a back View of a safety envelop constructed in accordance with the invention, the sealing flap being swung upwardly into an open position. Fig. 2 is a similar view of the envelop with the sealing flap closed. Fig. 3 is a view similar to Fig. 2, showing a modification of the invention.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Specifically describing the present embodiment of the invention, the numeral 1 designates the front of the envelop, or that portion upon which the address is ordinarily written, 2 the bottom flap, 3 the end flaps, and 4 the sealing flap. The bottom flap 2 is preferably of a sufficient length to extend nearly to the upper edge of the envelop, the tapered side edges of the bottom flap overlapping the edges of the end flaps E3 and being secured thereto by some adhesive material. The sealing flap 4 is preferably comparatively narrow in width and extends the full length of the envelop so as to be secured to the two end flaps 3 as well as to the bottom-flap 2 when the envelop is sealed. A layer of adhesive 5 extends the full length of the sealing flap 3, and a portion of the paper to which the layer of adhesive is applied is treated in such a manner as to make it transparent or translucent, as indicated at 6/ This transparent portion or window 6 preferably eX- tends over a suflicient area of the sealing flap 4 to cover portions up both of the end flaps 3 and the bottom flap 2 when the en velop is closed. Before sealing the envelop the signature of the sender will be written with an indelible pencil uponthe adhesive 5 which is applied to the window portion 6 of the envelop, such a signature being indicated at 7. Moisture will then be applied to a properly designated area 8 on the back of the envelop, after which the sealing flap will be closed and held against the back of the envelop until it is firmly stuck in position. The signature 7 written with an indelible pencil is clearly visible through the transparent or translucent window 6 of the sealing flap, and any attempt to open the flap by the use of moisture or steam will result in smearing the ink of the signature to such an extent as to indicate very clesifly that the envelop has been tampered wit In the modification illustrated by Fig. 2;,

the edge portions of the bottom fiap 2 are for-med with transparent or translucent win dows 9 which are similar in respect to the before mentioned window 6 of the sealing flap. With this form of envelop all of the flaps would be originally separated or unsealed, and the sender would place his signature upon the adhesive back of the two windows 9 as well as upon the adhesive back of the window 6 before sealing the envelop. The various flaps wouldv then be sealed as in the previous instance, and any attempt to soften the adhesive upon any of the seams of the envelop by the use of steam or moisture would result in smearing the ink of one or more of the signatures, thereby making it absolutely impossible to open the envelop without detection after it has once been sealed.

rial under-the Window portion Will be visible through the same When the envelop is sealed.

In testimony whereof I have signed my name to this specification in the presence of tWo subscribing Witnesses.


Having thus described the invention, What I claim as new and desire to secure by Letters Patent, is

A safety envelop formed With an integral 5 sealing flap having a layer of adhesive applied to the under side thereof for use in sticking the flap to seal the'envelop, said flap being provided With a Window portion over the layer 01": adhesive material so that 1 characters Written upon the adhesive mate- Vitnesses:


Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents Washington, D. 0.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3895755 *27 Feb 197422 Jul 1975Lawrence Peska Ass IncTamper proof envelope
US3933304 *22 Feb 197420 Jan 1976Decoflex LimitedBags for containing bank notes
US4941196 *1 Nov 198810 Jul 1990Kcl CorporationTamper evident bag
US6270256 *29 Dec 19977 Aug 2001Sealed Air CorporationTamper evident bag
US6866184 *23 Oct 200115 Mar 2005James T. WoodMail container with contaminant indicator
US70903973 Jun 200415 Aug 2006Stolmeier Robert CSingle use container
US7350687 *23 Nov 20041 Apr 2008Pitney Bowes Inc.Tamper resistant envelope
US20050051609 *15 Oct 200410 Mar 2005Wood James T.Mail container with contaminant indicator
US20060108405 *23 Nov 200425 May 2006Pitney Bowes IncorporatedTamper resistant envelope
US20060204147 *30 May 200614 Sep 2006Illinois Tool Works, Inc.Single use container
U.S. Classification229/80, 229/83
Cooperative ClassificationB65D27/16