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Patent US3671239A successfully refreshed from Google Patents.
US3671239A
Expired / Lapsed
US
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Photodecomposition of oxazolidinediones and similar anhydrides
Assignee: Wyeth Holdings LLC
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Filing: 1971-01-12
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Granted: 1972-06-20
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Expires: 1991-01-12
Abstract
Abstract A SYSTEM FOR STORAGE OF INFORMATION AND COLOR PHOTOGRAPHY COMPRISING THE USE OF A DYE PRECURSOR CAPABLE OF PHOTOCHEMICAL CONVERSION TO A PERMANENT VISIBLE IMAGE UNDER LIGHT OF A PARTICULAR WAVELENGTH, OR HEAT, IS PROVIDED, SAID MATERIAL BEING AN ANHYDRIDE COMPOUND OF THE FORMULA: 3-R",4-(-R''-R-)-OXAZOLIDINE-2,5-DIONE WHEREIN R AND R'' EACH REPRESENT HYDROGEN, PHENYL OR SUBSTITUTED PHENYL, OR TAKEN TOGETHER REPRESENT A SPIROLINKED FLUORENYL, NAPHTHYL, OR PYROZALYL SUBSTITUENT, AND R" REPRESENTS HYDROGEN, PHENYL OR SUBSTITUTED PHENYL.
Inventors
- 👤 Arnold Zweig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; C; C07; C07D; C07D263/00; C07D263/02; C07D263/30; C07D263/34; C07D263/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |