Patent US3761422A successfully refreshed from Google Patents.
US3761422A
Expired / Lapsed
US
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Polyvinyl chloride films therefrom and the resultant films photochromic plastisol compositions method of producing photochromic
Assignee: Nuclear Research Associates Inc
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Filing: 1972-01-31
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Granted: 1973-09-25
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Expires: 1992-01-31
Abstract
Abstract A PHOTOCHROMIC PLASTISOL COMPOSITION CONSISTING ESSENTIALLY OF: 35% TO 80% BY WEIGHT OF AN ESSENTIALLY PURE POLYVINYL CHLORIDE RESIN CONTAINING LESS THAN 2.5% BY WEIGHT O METHANOL EXTRACTABLES AND LESS THAN 1% BY WEIGHT OF VOLATILE CONSTITUENTS; 32 TO 60% BY WEIGHTS OF AT LEAST ONE OF DIOCTYL PHTHALTE AND TRICESYL PHOSPHATE; 0.7 TO WEIGHT OF AT LEAST ONE OF MERCURIC, ZINC OR LEAD BIS-DIPHENYLTHIOCARBAZONE. THESE COMPOSITIONS MAY BE FORMED INTO FILMS.
Inventors
- 👤 P Silver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:27
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/23; G03; G03C; G03C1/00; G03C1/72; G03C1/73; Y; Y10; Y10S; Y10S430/00; Y10S430/163; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31645
Claims Analysis
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |