Patent US3774574A successfully refreshed from Google Patents.
US3774574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development device for electrophotography
Assignee: Fujifilm Holdings Corp
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Filing: 1971-12-10
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Granted: 1973-11-27
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Expires: 1991-12-10
Abstract
Abstract A development device for the electrostatic photography, which comprises electroconductive electrode rollers operating as development electrodes respectively disposed movably upwardly and downwardly on a plurality of driving rollers arranged on a nearly horizontal level, and endless belt protruding from the roller surfaces and mounted on both ends of the electrode rollers so as to carry electrophotographic material held between the endless belt and driving rollers, wherein plates are provided to shield a space between the electrode rollers in contact and adjacent to the endless belt, and comprising means for supplying a liquid developer over the electrode rollers.
Inventors
- 👤 M Sato
- 👤 I Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/101
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A development device for the electrostatic photography, which comprises electroconductive electrode rollers operating as development electrodes respectively disposed above a plurality of driving rollers arranged on a nearly horizontal level, an endless belt protruding from the roller surfaces and mounted on both ends of said electrode rollers for conveying electrophotographic material held between said endless belt and driving rollers, provided to shield a space between the electrode rollers in substantial contact and adjacent to said endless belt, and means for supplying a liquid developer from above and over said electrode rollers so that a pool of said developer is formed in said space which is bounded by said plates, said electrophotographic material, said endless belts, and said electrode rollers to thereby improve the development of said electrostatic material.
Claim 2
Dependent Claim
128 words
A development device for the electrostatic photography, which comprises electroconductive electrode rollers operating as development electrodes respectively disposed above a plurality of driving rollers arranged on a nearly horizontal level, an endless belt protruding from the roller surfaces and mounted on both ends of said electrode rollers for conveying electrophotographic material held between said endless belt and driving rollers, provided to shield a space between the electrode rollers in substantial contact and adjacent to said endless belt, and means for supplying a liquid developer from above and over said electrode rollers so that a pool of said developer is formed in said space which is bounded by said plates, said electrophotographic material, said endless belts, and said electrode rollers to thereby improve the development of said electrostatic material.
Claim 3
Dependent Claim
17 words
A development device as in claim 1 including means for positioning said electrode rollers upwardly and downwardly.
Claim 4
Dependent Claim
23 words
A development device as in claim 1 wherein the ends of said electrode rollers and said driving rollers are journalled in said plate.
Claim 5
Dependent Claim
34 words
A development device as in claim 1 including a further plate in which the ends of said electrode rollers and said driving rollers are journalled, said first-mentioned plate being supported by said electrode rollers.
Claim 6
Dependent Claim
32 words
A development device as in claim 4 wherein said first-mentioned plate is disposed in grooves at the ends of said electrode rollers and so shaped as to be supported by electrode rollers.
References Cited (Backward Citations)
US1819848A
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US3330683A
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US3328193A
Cited
US3299791A
Cited
US3301156A
Cited
US3556050A
Cited
US3601092A
Cited
US3672329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |