US3679406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heterogeneous photoconductor composition formed by low-temperature conditioning
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 HETEROGENEOUS PHOTOCONDUCTIVE COMPOSITIONS ARE FORMED BY FIRST DISSOLVING A DYE IN A SOLVENT. AFTER SUBSTANTIAL DISSOLUTION OF THE DYE, POLYMER AND PHOTOCONDUCTOR ARE ADDED TO THE DYE SOLUTION TO FORM A COATING DOPE. THE RESULTANT DOPE IS SUBJECTED TO LOW-TEMPERATURE CONDITIONING BY COOLING TO A REDUCED TEMPERATURE AND HOLDING AT THAT TEMPERATURE FOR A PERIOD OF TIME. THE CONDITIONED DOPE IS THEN WARMED TO COATING TEMPERATURE, COATED AS A THIN FILM AND ALLOWED TO DRY TO FORM A HETEROGENEOUS COMPOSTION CONTAINING SUBMICRON SIZED PARTICLES OF A CO-CRYSTALLINE COMPLEX. ELECTROPHOTOGRAPHIC ELEMENTS ARE FORMED BY COATING THIS DOPE ON A SUPPORT.
Inventors
- 👤 Frederick J Kryman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:08
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0525
Claims Analysis
Total Claims: 0
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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 |