Patent US3745004A successfully refreshed from Google Patents.
US3745004A
Expired / Lapsed
US
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Photodecomposition of diazasuccinic and similar anhydrides
Assignee: Wyeth Holdings LLC
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Filing: 1971-07-09
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Granted: 1973-07-10
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Expires: 1991-07-09
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 IS PROVIDED, SAID MATERIAL BEING BEING AN ANHYDRIDE OF AN AROMATIC SUBSTITUTED HETEROCYCLIC COMPOUND.
Inventors
- 👤 A Zweig
- 👤 W Henderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:11
CPC Classifications
C; C07; C07D; C07D271/00; C07D271/02; C07D271/10; C07D271/113; B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |