Patent US3370026A successfully refreshed from Google Patents.
US3370026A
Expired / Lapsed
US
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Method of producing photochromic castings
Assignee: Wyeth Holdings LLC
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Filing: 1964-09-24
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Granted: 1968-02-20
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Expires: 1984-09-24
Abstract
No abstract record available.
Inventors
- 👤 Patella Lawrence Joseph
- 👤 Giddings Sydney Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:42
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/733; C; C08; C08F; C08F8/00; C08K; C08K5/00; C08K5/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3198776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-02-19 | 1971-08-21 | 1972-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-02-19 | 1975-08-21 | 1976-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-02-19 | 1979-08-21 | 1980-02-20 | $7700.00 | Window Closed / Lapsed |