|
| US4032227 | 15 Jan 1976 | 28 Jun 1977 | International Business Machines Corporation | Toner concentration control apparatus |
| US4088092 | 25 Apr 1977 | 9 May 1978 | Ricoh Co., Ltd. | Toner density sensing apparatus for electrostatic copying machine |
| US4101214 | 31 Dec 1975 | 18 Jul 1978 | Minolta Camera Kabushiki Kaisha | Toner dispensing device with electrical integrating circuit |
| US4110239 | 14 Jun 1976 | 29 Aug 1978 | Lever Bros. Co. | Quick lathering toilet bars and method of making same |
| US4112867 | 24 Feb 1977 | 12 Sep 1978 | Ricoh Company, Ltd. | Apparatus for controlling the toner concentration of a developer used in a dry type developing system |
| US4131081 | 1 Apr 1977 | 26 Dec 1978 | Hitachi, Ltd. | Toner concentration detecting apparatus |
| US4147127 | 13 Oct 1977 | 3 Apr 1979 | Hitachi, Ltd. | Toner concentration detecting apparatus |
| US4190018 | 2 Feb 1979 | 26 Feb 1980 | Pitney-Bowes, Inc. | Powder density control circuit for a photocopier |
| US4200665 | 1 May 1978 | 29 Apr 1980 | | Method for controlling the toner concentration of a developer used in a dry type developing system |
| US4257348 | 16 Jun 1978 | 24 Mar 1981 | Hoechst Aktiengesellschaft | Device measuring the concentration of toner in a developer mixture |
| US4270487 | 19 Oct 1978 | 2 Jun 1981 | Hitachi, Ltd. | Developer regulating device in developing apparatus |
| US4273843 | 5 Jun 1979 | 16 Jun 1981 | Konishiroku Photo Industry Co., Ltd. | Method of detecting toner concentration in electrophotographic copying machine |
| US4357103 | 27 Mar 1981 | 2 Nov 1982 | Eastman Kodak Company | Electrographic apparatus and method featuring compressed-field, magnetic brush development |
| US4357901 | 3 Sep 1981 | 9 Nov 1982 | Bunnington Corporation | Method and system for magnetically sensing and controlling toner concentration and optical density of copies in electrostatic reproduction |
| US4364659 | 14 May 1980 | 21 Dec 1982 | Katsuragawa Electric Co., Ltd. | Controlling toner concentration of dry developing agent in electrophotography |
| US4462680 | 13 May 1982 | 31 Jul 1984 | Canon Kabushiki Kaisha | Apparatus for controlling toner density |
| US4611900 | 1 Jun 1984 | 16 Sep 1986 | Xerox Corporation | Apparatus for sensing the presence of toner particles |
| US4652111 | 9 Jul 1985 | 24 Mar 1987 | Sanyo Electric Co., Ltd. | Electrostatic recording apparatus |
| US4742370 | 19 Nov 1986 | 3 May 1988 | Kabushiki Kaisha Toshiba | Developing device with toner density adjustment |
| US4821075 | 16 Sep 1987 | 11 Apr 1989 | Ricoh Company, Ltd. | Developing device and developer supply device for the same |
| US4891675 | 29 Aug 1988 | 2 Jan 1990 | Sharp Kabushiki Kaisha | Developer density detection device |
| US5426486 | 22 Feb 1994 | 20 Jun 1995 | Eastman Kodak Company | Toner monitor having magnetic field control |
| US5705924 | 7 Feb 1997 | 6 Jan 1998 | Eastman Kodak Company | Hall effect sensor for detecting an induced image magnet in a smooth material |
