Patent US5733714A successfully refreshed from Google Patents.
US2962983A
Expired / Lapsed
US
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Railway hopper car door locks
Assignee: UNITCAST CORP
•
Filing: 1956-09-25
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Granted: 1960-12-06
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Expires: 1976-09-25
Abstract
No abstract record available.
Inventors
- 👤 Ingram Orville
- 👤 William J Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:52
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; Y; Y10; Y10T; Y10T292/00; Y10T292/62
Claims Analysis
Total Claims: 0
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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) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |