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US2640603A
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Cushioning mechanism for railway vehicles
Assignee: National Malleable and Steel Castings Co
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Filing: 1950-09-01
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Granted: 1953-06-02
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Expires: 1970-09-01
Abstract
No abstract record available.
Inventors
- 👤 Willison Donald
- 👤 Hubert L Spence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:25
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/06; F; F16; F16F; F16F1/00; F16F1/36; F16F1/40; F16F1/406
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) | 1956-06-01 | 1956-12-01 | 1957-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-01 | 1960-12-01 | 1961-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-01 | 1964-12-01 | 1965-06-02 | $7700.00 | Window Closed / Lapsed |