Patent US2971576A successfully refreshed from Google Patents.
US2496916A
Expired / Lapsed
US
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Scotch block apparatus
Assignee: Westinghouse Air Brake Co
•
Filing: 1947-01-14
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Granted: 1950-02-07
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Expires: 1967-01-14
Abstract
No abstract record available.
Inventors
- 👤 Norman G Kershaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:02
CPC Classifications
B; B61; B61K; B61K7/00; B61K7/16; B61K7/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |