Patent US3591381A successfully refreshed from Google Patents.
US3591381A
Expired / Lapsed
US
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Stabilized diazotype composition
Assignee: Eastman Kodak Co
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Filing: 1967-07-31
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Granted: 1971-07-06
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Expires: 1987-07-31
Abstract
Abstract THE FADING OF AZO DYES IS INHIBITED BY THE PRESENCE OF CERTAIN HINDERED PHENOLS WHICH ARE SUBSTITUTED IN THE 2-POSITION AND IN THE 4-POSITION. THESE HINDERED PHENOLS ARE PARTICULARLY USEFUL 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 A NEUTRAL IMAGE AFTER EXPOSURE AND DEVELOPMENT.
Inventors
- 👤 William C Gray
- 👤 Frederick A Stahly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:21
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |