Patent US3451458A successfully refreshed from Google Patents.
US3451458A
Expired / Lapsed
US
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Silica filled synthetic rubber compositions and tire treads
Assignee: PPG Industries Inc
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Filing: 1965-03-16
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Granted: 1969-06-24
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Expires: 1985-03-16
Abstract
No abstract record available.
Inventors
- 👤 Curtis C Stueber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:52
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; Y; Y10; Y10S; Y10S152/00; Y10S152/905
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) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |