Patent US3573052A successfully refreshed from Google Patents.
US3573052A
Expired / Lapsed
US
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Diazotype materials of improved stability
Assignee: Eastman Kodak Co
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Filing: 1967-10-30
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Granted: 1971-03-30
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Expires: 1987-10-30
Abstract
Abstract THE FADING OF AZO DYES IS INHIBITED BY THE PRESENCE OF CERTAIN POLYMERIC MEATERIALS, BOTH ALONE AND IN COMBINATION WITH CERTAIN HINDERED PHENOLS WHICH ARE SUBSTITUTED IN THE 2-POSITION AND IN THE 4-POSITION. THESE STABLIZIZING POLYMERS ARE PARTICULARLY UEFUL AS BINDER MATERIALS IN DIAZOTYPE REPRODUCTION MEDIA, ESPECIALLY THE "TWO COMPONENT" MEDIA CONTAINING A DIAZONIUM SALT, A BLUE COUPLER AND A YELLOW COUPLER IN PROPORTIONS SUFFICIENT TO YIELD AN AZO DYE IMAGE OF NEUTRAL HUE AFTER EXPOSURE AND DEVELOPMENT.
Inventors
- 👤 William C Gray
- 👤 Frederick A Stahly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/60; G03C1/61
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |