Patent US3905332A successfully refreshed from Google Patents.
US3905332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic developing apparatus using developing roller
Assignee: Ricoh Co Ltd
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Filing: 1973-10-30
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Granted: 1975-09-16
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Expires: 1993-10-30
Abstract
Abstract An electrophotographic developing apparatus which supplies a developing solution to only one surface of the copy sheet which is to be developed, by using a developing roller, around the periphery of which are provided multiple threads having an optimum lead angle for the supply of the solution.
Inventors
- 👤 Hideo Sawada
- 👤 Van Hirafuji
- 👤 Kenya Komada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:22
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A developing apparatus for use at the developing station in wet-type electrophotographic copying machines comprising: a. a tank for holding and supplying a developing solution; and b. a developing roller means, disposed at the developing station and adjacent said tank with the peripheral surface thereof forming at least a part of a wall of said tank, for receiving developing solution from said tank on its peripheral surface and transferring it to the surface of a sheet fed thereby, said roller means rotating at a peripheral speed greater than the speed at which a sheet to be developed is fed thereby, and said peripheral surface of said roller means being formed with a series of threads having a lead angle Alpha in accordance with the relationship:
Claim 2
Dependent Claim
125 words
A developing apparatus for use at the developing station in wet-type electrophotographic copying machines comprising: a. a tank for holding and supplying a developing solution; and b. a developing roller means, disposed at the developing station and adjacent said tank with the peripheral surface thereof forming at least a part of a wall of said tank, for receiving developing solution from said tank on its peripheral surface and transferring it to the surface of a sheet fed thereby, said roller means rotating at a peripheral speed greater than the speed at which a sheet to be developed is fed thereby, and said peripheral surface of said roller means being formed with a series of threads having a lead angle Alpha in accordance with the relationship:
Claim 3
Dependent Claim
16 words
Apparatus as in claim 1 wherein said lead angle Alpha is less than 2 tan 1
Claim 4
Dependent Claim
28 words
Apparatus as in claim 1 wherein said lead angle Alpha is in the range from 45* to 60* and V2/V1 is in the range from 2 to 4.
Claim 5
Dependent Claim
39 words
Apparatus as in claim 1 further comprising a cleaning member abutting aGainst the peripheral surface of said developing roller means at a point in the rotation of said developing roller means subsequent to its passing through said developing station.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |