Patent US3573050A successfully refreshed from Google Patents.
US3573050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic layers comprising non-diffusible 5-hydroxycoumarans as stabilizing compounds
Assignee: Eastman Kodak Co
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Filing: 1969-02-27
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Granted: 1971-03-30
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Expires: 1989-02-27
Abstract
Abstract NONDIFFUSIBLE 5-HYDROXYCOURMARAN STABLIZER COMPOUNDS WHICH HAVE EITHER A SUBSTITUTED AMINO GROUP OR AN ALKOXY GROUP SUBSTITUTED ON THE CARBON ATOMS IN THE 2 POSITION ARE ADVANTAEOUSLY INCORPORATED IN HYDROPHILIC COLLOID LAYERS OF PHOTOGRAPHIC ELEMENTS IN WHICH COLOR PHOTOGRAPHIC DYE IMAGES ARE TO BE STORED FOR VIEWING. THE STABLIZER COMPOUNDS PROTECT DYE IMAGES AGAINST THE FADING EFFECTS OF PROLONGED EXPOSURE TO LIGHT.
Inventors
- 👤 Kent C Brannock
- 👤 Gregory J Lestina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:26
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/8155
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 |