Patent US3554946A successfully refreshed from Google Patents.
US3554946A
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Liquid developers for electrophotography containing a pigment coated with a copolymer
Assignee: Ricoh Co Ltd
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Filing: 1967-11-13
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Granted: 1971-01-12
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Expires: 1987-11-13
Abstract
Abstract A LIQUID DEVELOPER FOR ELECTROPHOTOGRAPHY PREPARED BY ADDING, TO A PIGMENT, AN ELECTRIC CHARGE POLARITY CONTROLLING AGENT CONSISTING OF A SYNTHETIC RESIN AND HAVING A NOVEL CHEMICAL STRUCTURE, KNEADING THE MIXTURE, AND DISPERSING THE KNEADED MIXTURE EITHER INDEPENDENTLY OR TOGETHER WITH A SURFACE ACTIVE AGENT IN A CARRIER LIQUID CONSISTING OF A HYDROCARBON HAVING A HIGH ELECTRIC RESISTANCE (A SPECIFIC RESISTANCE OF 10**10$ CM. OR MORE) AND A LOW DIELECTRIC CONSTANT OF 3 OR LESS.
Inventors
- 👤 Zenjiro Okuno
- 👤 Itsuo Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:19
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/122; G03G9/13; G03G9/131; G03G9/1355; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/105
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |