US3355294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photochromic compositions containing bleaching rate accelerators
Assignee: Wyeth Holdings LLC
•
Filing: 1964-12-09
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Granted: 1967-11-28
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Expires: 1984-12-09
Abstract
No abstract record available.
Inventors
- 👤 Giddings Sydney Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:49
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733; C; C08; C08K; C08K5/00; C08K5/56; C08L; C08L67/00; C08L75/00; C08L75/04; Y; Y10; Y10S; Y10S430/00; Y10S430/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A COMPOSITOR OF MATTER COMPRISING (U) A POLYMER, (2) A SOLVENT THEREFOR, (3) A METAL COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
19 words
A COMPOSITOR OF MATTER COMPRISING (U) A POLYMER, (2) A SOLVENT THEREFOR, (3) A METAL COMPOUND HAVING THE FORMULA
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) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |