Patent US2901985A successfully refreshed from Google Patents.
US2901985A
Expired / Lapsed
US
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Hopper door latching mechanism
Assignee: Enterprise Railway Equipment Co
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Filing: 1953-11-13
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Granted: 1959-09-01
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Expires: 1973-11-13
Abstract
No abstract record available.
Inventors
- 👤 George B Dorey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:10
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B65; B65D; B65D90/00; B65D90/54; B65D90/62; B65D90/623; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/1043; Y10T292/1063; Y10T292/1064; Y10T292/1072
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790295A
Cited
US1774870A
Cited
CH246933A
Cited
US2641198A
Cited
US2620746A
Cited
US2624293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-31 | 1963-03-02 | 1963-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-31 | 1967-03-02 | 1967-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-31 | 1971-03-02 | 1971-09-01 | $7700.00 | Window Closed / Lapsed |