Patent US4167543A successfully refreshed from Google Patents.
Patent US3574627A successfully refreshed from Google Patents.
US3574627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic elements
Assignee: Eastman Kodak Co
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Filing: 1969-02-06
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Granted: 1971-04-13
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Expires: 1989-02-06
Abstract
Abstract NONDIFFUSIBLE HYDROXYLATED TRINUCLEAR STABILIZER COMPOUNDS INCLUDING THE 2,2 - (B-ISOPROPYL)-TETRAMETHYLENE6-CHROMANOLS, THE 2-2-(B,B-DIMETHYL)-PENTAMETHYLENE-6CHROMANOLS AND THE 5A,6,7,8,9,9A - HEXAHYDRO-2-DIBENZOFURANOLS ARE ADVANTAGEOUSLY INCORPORATED IN HYDROPHILIC COLLOID LAYERS OF PHOTOGRAPHIC ELEMENTS IN WHICH COLOR PHOTOGRAPHIC DYE IMAGES ARE TO BE STORED FOR VIEWING. THE STABILIZER COMPOUNDS PROTECT DYE IMAGES AGAINST THE FADING EFFECTS OF PROLONGED EXPOSURE TO LIGHT.
Inventors
- 👤 Max H Stern
- 👤 Gregory J Lestina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:37
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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |