Patent US20030004574A1 successfully refreshed from Google Patents.
US3574456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing electrophotographic copies
Assignee: Ricoh Co Ltd
•
Filing: 1967-10-10
•
Granted: 1971-04-13
•
Expires: 1987-10-10
Abstract
Abstract Apparatus for electrophotographic sequential color printing by returning the sensitizable paper to the starting position a required number of times and exposing and developing with different color conditions each time, and an applicator for the developer. An exposure station and a developer station are provided and timing means select the color exposure and development.
Inventors
- 👤 Archie R Grace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:15
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
53 words
An electrophotographic color copier according to claim 1 wherein an image is projected onto a photoconductive sheet carried on a moving member, and is developed by directing liquid developer upwardly on to the face of the photoconductive sheet as it passes face down above a tray from which the liquid projection takes place.
Claim 2
Dependent Claim
40 words
An electrophotographic color copier according to claim 1 wherein the developer is directed against the face of the photoconductive sheet by vanes which move in a tray of liquid and are shaped to direct the liquid upwards during such movement.
Claim 3
Dependent Claim
23 words
An electrophotographic color copier according to claim 1 wherein the developer is placed into motion and is then directed upwards by fixed vanes.
Claim 4
Dependent Claim
39 words
An electrophotographic color copier according to claim 4 wherein the developer is directed so that it strikes the face of the photoconductive sheet obliquely to cause the developer to move over the sheet and return to the developer tray.
Claim 5
Dependent Claim
24 words
An electrophotographic color copier according to claim 1 wherein the photoconductive sheet is subjected to a corona discharge prior or after each colorwise exposure.
Claim 6
Dependent Claim
216 words
An electrophotographic color copier of the type wherein a photoconductive sheet has a latent electrostatic image produced thereon at an exposure station and then passes through a developing station, characterized by: a belt to hold and transport the said sheet on which the image is to be produced sequentially through said stations in a recurring path, said path including movement of the belt over developer means with the face of the photoconductive sheet facing downwards, means to effect said exposure colorwise, means to effect said development colorwise by means of a liquid developer which fixes on evaporation of the carrier liquid and in which the toner is carried, said developer being projected upwardly onto the said photoconductive sheet, and timing means to sequentially select said colorwise exposure and development, whereby said copy sheet is first exposed to an image of a selected color, is then developed by liquid of the complimentary color by washing the liquid upwards against the face of the photoconductive sheet, then returns to the exposure position after drying of the developed image by evaporation of the carrier liquid of the developer where a latent image of a different color value is then produced, and then passes through the complimentary developer and so on until the complete color values required have been reproduced.
Claim 7
Dependent Claim
70 words
An electrophotographic color copier according to claim 7 wherein color filters are successively interposed in a liquid image which is projected onto the photoconductive surface, and each developer is contained in a tray provided with means which successively raises the liquid developer to a higher level to contact the sheet, and means to correlate the movement of the filters and the developer tray actuating mechanism for successive exposure and development.
References Cited (Backward Citations)
US3192846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |