Patent US3681243A successfully refreshed from Google Patents.
US3681243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid developer for electrophotography containing stain texture preventing agent
Assignee: Ricoh Co Ltd
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Filing: 1969-05-22
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Granted: 1972-08-01
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Expires: 1989-05-22
Abstract
Abstract THE INVENTION RELATES TO A LIQUID DEVELOPER FOR ELECTROPHOTOGRAPHY, COMPRISING A CARRIER LIQUID AND A TONER DISPERSED IN SAID CARRIER LIQUID, WHEREIN SAID DEVELOPER CONTAINS AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF METAL-DIALKYL-DITHIOPHOSPHATES, SODIUMALKYL-PHOSPHATES, ALKY-PHOSPHATES, ALKALI METAL-ALKYLSULFATES, ALCOHOLS, MONOCARBOXYLIC ACIDS, PHTHALIC ACID, ALKYL PHTHALATES, AMMONIA, AMINES, ALDEHYDES, DEKALIN, AZOBENZENE, CAMPHOR, CITRAL AND SYRENE.
Inventors
- 👤 Zenjiro Okuno
- 👤 Akinori Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:33
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/135; G03G9/1355
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |