Patent US2533639A successfully refreshed from Google Patents.
US2533639A
Expired / Lapsed
US
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Railway truck
Assignee: General Steel Castings Corp
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Filing: 1948-05-07
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Granted: 1950-12-12
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Expires: 1968-05-07
Abstract
No abstract record available.
Inventors
- 👤 Jr James C Travilla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:37
CPC Classifications
B; B61; B61F; B61F5/00; B61F5/26; B61F5/30; B61F5/36; B61F3/00; B61F3/02; B61F3/08
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) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |