Patent US3679453A successfully refreshed from Google Patents.
US3679453A
Expired / Lapsed
US
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Developing method and device therefor for use in wet type electronic or electrostatic photography
Assignee: Ricoh Co Ltd
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Filing: 1969-03-21
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Granted: 1972-07-25
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Expires: 1989-03-21
Abstract
Abstract A DEVELOPING METHOD AND DEVICE THEREFOR FOR USE IN WET TYPE ELECTROSTATIC PHOTOGRAPHY WHEREIN THE POLARITIES OF DC VOLTAGE APPLED TO A PAIR OF BIAS ELECTRODES ARE REVERSED. ACCUMULATION OF DEVELOPING TONER TO THE ELECTRODES CAN BE PREVENTED.
Inventors
- 👤 Nobuyuki Katagiri
- 👤 Hideaki Akiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:47
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |