US3485764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric photochromic compositions stabilized with ultraviolet light absorbers
Assignee: Wyeth Holdings LLC
•
Filing: 1964-12-24
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Granted: 1969-12-23
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Expires: 1984-12-24
Abstract
No abstract record available.
Inventors
- 👤 John Kazan Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:01
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |