US5075735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic apparatus using developer that is changed from a solid to a liquid
Assignee: Sony Corp
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Filing: 1990-12-11
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Granted: 1991-12-24
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Expires: 2010-12-11
Abstract
Abstract An electrophotographic apparatus utilizes solid developers of a plurality of colors for developing an electrostatic latent image. The solid developers are solid at normal temperature and are changed into liquid by heating. The liquid developers are supplied to the static latent image and develop it. The solid developers of a plurality of colors are accommodated within a single container in a predetermined order so that the electrophotographic apparatus can be simplified and made inexpensive.
Inventors
- 👤 Takao Tsuchiya
- 👤 Akira Shirakura
- 👤 Haruo Watanabe
- 👤 Koichi Kawasumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:54
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/125; G03G15/00; G03G15/01; G03G15/0105; G03G15/0121; G03G15/06; G03G15/08; G03G15/0822; G03G15/0877; G03G9/122; G03G9/135
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A developer cartridge comprising: a plurality of developers of a corresponding plurality of colors for developing an electrostatic latent image being arranged in a predetermined order, in which said developers are solid at room temperature and are changed into liquid by heating; and a single container for supporting said solid developers.
Claim 2
Dependent Claim
51 words
A developer cartridge comprising: a plurality of developers of a corresponding plurality of colors for developing an electrostatic latent image being arranged in a predetermined order, in which said developers are solid at room temperature and are changed into liquid by heating; and a single container for supporting said solid developers.
Claim 3
Dependent Claim
29 words
A developer cartridge according to claim 1 wherein said solid developers of each color are divided into a plurality of pieces each having a quantity for making one picture.
Claim 4
Dependent Claim
17 words
A developer cartridge according to claim 1 wherein said plurality of colors include yellow, magenta and cyan.
Claim 5
Dependent Claim
21 words
A developer cartridge according to claim 1 wherein said container comprises a belt carrying said solid developers in a predetermined order.
Claim 6
Dependent Claim
20 words
A developer cartridge according to claim 1 wherein said container comprises separate compartments for each color of said solid developers.
Claim 7
Dependent Claim
133 words
An electrophotographic apparatus comprising: a cartridge comprising a single container for supporting solid developers of a plurality of colors in a predetermined order for developing an electrostatic latent image, with said solid developers being solid at room temperature and changed to a liquid by heating; a photoconductor drum for forming an electrostatic latent image on its surface; a first charger for charging said photoconductor drum to a first polarity; exposure means for extinguishing the charges on said photoconductor drum corresponding to image information and forming an electrostatic latent image on said photoconductor drum; a heater for heating and melting said solid developers into liquid; a second charger for charging melted developers to a polarity opposite to that of the charges on said photoconductor drum; and a waste developer tank for receiving excess developer.
Claim 8
Dependent Claim
133 words
An electrophotographic apparatus comprising: a cartridge comprising a single container for supporting solid developers of a plurality of colors in a predetermined order for developing an electrostatic latent image, with said solid developers being solid at room temperature and changed to a liquid by heating; a photoconductor drum for forming an electrostatic latent image on its surface; a first charger for charging said photoconductor drum to a first polarity; exposure means for extinguishing the charges on said photoconductor drum corresponding to image information and forming an electrostatic latent image on said photoconductor drum; a heater for heating and melting said solid developers into liquid; a second charger for charging melted developers to a polarity opposite to that of the charges on said photoconductor drum; and a waste developer tank for receiving excess developer.
Claim 9
Dependent Claim
21 words
An electrophotographic apparatus according to claim 6 wherein said heater is common to said solid developers of a plurality of colors.
Claim 10
Dependent Claim
22 words
An electrophotographic apparatus according to claim 6 wherein said second charger is common to said solid developers of a plurality of colors.
Claim 11
Dependent Claim
15 words
An electrophotographic apparatus according to claim 6 wherein said exposure means includes a semiconductor laser.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |