Patent US3790485A successfully refreshed from Google Patents.
US3790485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing electrophotographic liquid developer
Assignee: Xerox Corp
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Filing: 1972-02-03
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Granted: 1974-02-05
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Expires: 1992-02-03
Abstract
Abstract A PROCESS FOR PRODUCING ELECTROPHOTOGRAPHIC LIQUID DEVELOPER CONTAINING FINELY DIVIDED POWDERED POLYPEPTIDE POLYMERIC PARTICLES WHICH COMPRISES PREPARING AN INTIMATE MIXTURE OF THE SAID POLYPEPTIDE MATERIAL AND A FERROMAGNETIC POWDER MATERIAL IN AN AQUEOUS SOLUTION SUBJECTING SAID MIXTURE TO A WET PROCESS CRUSHING IN A CARRIER LIQUID AND, AFTER SAID MIXTURE IS DRIED, REMOVING SAID FERROMAGNETIC POWDER FROM SAID MIXTURE BY MEANS OF A MAGNETIC FIELD.
Inventors
- 👤 M Sato
- 👤 Y Tamai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:29
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/135
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |