Patent US3679407A successfully refreshed from Google Patents.
US3679407A
Expired / Lapsed
US
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Method of forming heterogeneous photoconductive compositions and elements
Assignee: Eastman Kodak Co
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Filing: 1970-11-13
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Granted: 1972-07-25
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Expires: 1990-11-13
Abstract
Abstract A METHOD OF FORMING HETEROGENEOUS PHOTOCONDUCTIVE COMPOSITIONS COMPRISES THE STEPS OF FORMING A FIRST SOLUTION OF A CARBONATE POLYMER AND A PYRYLIUM DYE, SUBJECTING THE SOLUTION TO SHEARING ACTION, PREPARING A SECOND SOLUTION OF PYRYLIUM DYE ALONE AND COMBING THE FIRST AND SECOND SOLUTIONS WITH AN ORGANIC PHOTOCONDUCTOR AND A POLYMERIC BINDER DIFFERENT FROM THE CARBONATE POLYMER, COATING THE RESULTANT COMBINATION AND DRYING.
Inventors
- 👤 Curtis L Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:38
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525; G03G5/06; G03G5/0622; G03G5/0624; G03G5/0635; G03G5/0637
Claims Analysis
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References Cited (Backward Citations)
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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 |