Patent US2355376A successfully refreshed from Google Patents.
Patent US3431231A successfully refreshed from Google Patents.
US3431231A
Expired / Lapsed
US
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Silica and silica-containing vulcanizates
Assignee: Polysar Ltd
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Filing: 1967-01-23
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Granted: 1969-03-04
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Expires: 1987-01-23
Abstract
No abstract record available.
Inventors
- 👤 Jules Darcy
- 👤 John R Dunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:45
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08K9/00; C08K9/04; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3063; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/19; C01P2006/60; C01P2006/80
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) | 1972-03-03 | 1972-09-02 | 1973-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-03 | 1976-09-02 | 1977-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-03 | 1980-09-02 | 1981-03-04 | $7700.00 | Window Closed / Lapsed |