US3597212A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photosensitive elements and process
Assignee: Eastman Kodak Co
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Filing: 1968-10-30
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Granted: 1971-08-03
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Expires: 1988-10-30
Abstract
Abstract PHOTOSENSITIVE ELEMENTS AND A PROCESS OF PHOTOGRAPHIC REPRODUCTION ARE DESCRIBED EMPLOYING A PHOTOSENSITIVE COMPOSITION COMPRISING A HETEROCYCLIC NITROGEN COMPOUND AND A KETOMETHYLENE COMPOUND OR A REACTIVE CYCLIC AMMONIUM QUATERNARY SALT WHICH ON EXPOSURE TO ACTINIC RADIATION REACT TO FORM A DYE.
Inventors
- 👤 Frank G Webster
- 👤 Donald W Heseltine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/72; G03C1/73
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) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |