Patent US3642871A successfully refreshed from Google Patents.
US3642871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic ester compositions having enhanced color stability
Assignee: Eastman Kodak Co
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Filing: 1969-01-06
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Granted: 1972-02-15
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Expires: 1989-01-06
Abstract
Abstract ORGANIC ESTERS MAY BE PROVIDED WITH ENHANCED COLOR STABILITY UPON PROLONGED EXPOSURE TO ELEVATED TEMPERATURES BY INCORPORATING THEREIN A COMBINATION OF (A) ALKALI METAL ATOMS PROVIDED BY AT LEAST ONE ALKALI METAL CARBOXYLATE HAVING 2 TO 18 CARBON ATOMS OR ALKALI METAL ALKOXIDE HAVING 1 TO 6 CARBON ATOMS, AND (B) PHOSPHORUS ATOMS PROVIDED BY PHOSPHOROUS ACID. THE ORGANIC ESTERS INCLUDE ALIPHATIC ESTERS OF ALIPHATIC AND AROMATIC CARBOXYLIC ACIDS AND FATTY GLYCERIDES.
Inventors
- 👤 Clarence E Tholstrup
- 👤 Sarah J Rush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:47
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C67/00; C07C67/48; C07C67/62
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |