US2639044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction shock absorber for railway draft riggings
Assignee: W H MINER Inc
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Filing: 1950-03-30
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Granted: 1953-05-19
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Expires: 1970-03-30
Abstract
No abstract record available.
Inventors
- 👤 Harry W Mulcahy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
B; B61; B61G; B61G9/00; B61G9/04; B61G9/10
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) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |