Patent US3535256A successfully refreshed from Google Patents.
US3535256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light stabilizers for rigid pvc
Assignee: Wyeth Holdings LLC
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Filing: 1968-12-12
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Granted: 1970-10-20
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Expires: 1988-12-12
Abstract
No abstract record available.
Inventors
- 👤 Mary Lou Siano
- 👤 Matthew Peter Di Giaimo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:05
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/29; C08K5/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2641588A
Cited
US3084135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-19 | 1974-04-20 | 1974-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-19 | 1978-04-20 | 1978-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-19 | 1982-04-20 | 1982-10-20 | $7700.00 | Window Closed / Lapsed |