US3661899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
2(5h)-furanone compounds
Assignee: Eastman Kodak Co
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Filing: 1970-06-01
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Granted: 1972-05-09
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Expires: 1990-06-01
Abstract
Abstract CERTAIN 2(5H)-FURANONE COMPOUNDS ARE DESCRIBED AND CLAIMED. THESE COMPOUNDS, DEPENDING ON THEIR PARTICULAR STRUCTURE, ARE TEXTILE DYES, SENSITIZERS FOR ORGANIC PHOTOCONDUCTORS IN ELECTROPHOTOGRAPHY, ULTRAVIOLET ABSORBERS, FOR EXAMPLE, FOR LINEAR CONDENSATION POLYMERS OR USEFUL FOR THE HEAT STABILIZATION OF POLYESTERS, SUCH AS POLY(ETHYLENE TEREPHTHALATE). SOME OF THE COMPOUNDS HAVE MORE THAN ONE OF THE UTILITIES JUST MENTIONED. 3-CYANO-5ORTHONITROBENZYLIDENE - 4 - PHENYL - 2(5H) - FURANONE AND - 3 - CYANO-5-DIMETHYLAMINOMETHYLIDENE-4-PHENYL-2(5H)-FURANONE ARE ILLUSTRATIVE OF 2(5H)-FURANONE COMPOUNDS.
Inventors
- 👤 John A Ford Jr
- 👤 Charles V Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:04
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |