Patent US5498265A successfully refreshed from Google Patents.
US3729418A
Expired / Lapsed
US
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Liquid developer for electrostatic latent image
Assignee: Ricoh Co Ltd
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Filing: 1971-07-12
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Granted: 1973-04-24
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Expires: 1991-07-12
Abstract
Abstract A LIQUID DEVELOPER FOR DEVELOPMENT OF ELECTROSTATIC LATENT IMAGES IS PREPARED BY DISPERSING A COLORED SOLUTION INTO A CARRIER HAVING SPECIFIC INSULATION RESISTANCE OF MORE THAN 10**9 $-CM. AND A DIELECTRIC CONSTANT OF LESS THAN 3, SAID COLORED SOLUTION COMPRISING A POLAR SOLVENT, INSOLUBLE IN SAID CARRIER LIQUID, WITH SAID COLORED SUBSTANCE BEING DISSOLVED IN SAID SOLVENT.
Inventors
- 👤 H Machida
- 👤 A Tsurugi
- 👤 Z Okuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:11
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/13; G03G9/131; G03G9/125; 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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |