US3862618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developing apparatus for developing an electrostatic image
Assignee: Xerox Corp
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Filing: 1972-11-09
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Granted: 1975-01-28
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Expires: 1992-11-09
Abstract
Abstract A liquid developing apparatus for developing an electrostatic image formed on an electrophotographic surface using an aqueous solution as a developing electrode and a developing liquid which has a specific gravity less than that of the aqueous solution and is immiscible therewith. The developing liquid is floated on the aqueous solution and in contact with the electrostatic image surface, and is continuously circulated from a reservoir to the developing area, overflowing or decanting from the body of aqueous solution, and back to the reservoir.
Inventors
- 👤 Masamichi Sato
- 👤 Osamu Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:57
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A liquid developing Apparatus for electrostatic latent images which comprises a first tank having an open end portion and containing a body of electrically conducting liquid adapted to function as a development electrode, and a second tank having an open end portion and containing a body of liquid developer for electrostatic latent images, said first tank being disposed within said second tank and defining an annular channel therebetween, an element having an electrostatic latent image carrying surface extending into the open end portions of said first and second tanks and extending into said first tank, means for directing said electrostatic latent image carrying surface through said open end portions, and means for directing a flow of said developer liquid from the second tank and forming a thin film of developer between said surface and said conducting liquid.
Claim 2
Dependent Claim
137 words
A liquid developing Apparatus for electrostatic latent images which comprises a first tank having an open end portion and containing a body of electrically conducting liquid adapted to function as a development electrode, and a second tank having an open end portion and containing a body of liquid developer for electrostatic latent images, said first tank being disposed within said second tank and defining an annular channel therebetween, an element having an electrostatic latent image carrying surface extending into the open end portions of said first and second tanks and extending into said first tank, means for directing said electrostatic latent image carrying surface through said open end portions, and means for directing a flow of said developer liquid from the second tank and forming a thin film of developer between said surface and said conducting liquid.
Claim 3
Dependent Claim
45 words
The apparatus of claim 1, wherein the flow directing means comprises pump means disposed in the second tank and conduit means providing sealing communication from said pump means through the first tank to a zone in close proximity to the electrostatic latent image carrying surface.
Claim 4
Dependent Claim
21 words
The apparatus of claim 1, wherein said developer has a lower specific gravity than said conducting liquid and is immiscible therewith.
Claim 5
Dependent Claim
38 words
The apparatus of claim 1, wherein the annular channel between the first and second tank provides communication between said tanks so that the second tank can receive the developer flowing over the upper edge of the first tank.
Claim 6
Dependent Claim
15 words
The apparatus of claim 1, wherein the electrostatic latent image carrying surface is a drum.
Claim 7
Dependent Claim
32 words
The apparatus of claim 1, wherein the electrostatic latent image carrying surface is a web and guide roller means are provided for conveying said web into and out of the first tank.
References Cited (Backward Citations)
US3081263A
Cited
US3001888A
Cited
US3212916A
Cited
US3369524A
Cited
US3498917A
Cited
US3368526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |