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US3488290A
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Stabilized photochromic compositions containing antioxidant
Assignee: Wyeth Holdings LLC
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Filing: 1965-04-15
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Granted: 1970-01-06
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Expires: 1985-04-15
Abstract
No abstract record available.
Inventors
- 👤 Gerard Ernest Gerhardt
- 👤 Ralph Arthur Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; C; C07; C07F; C07F3/00; C07F3/10; C08; C08K; C08K5/00; C08K5/0091; G03C1/725; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA649852A
Cited
US3361706A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |