US2540281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Railway car door operating mechanism
Assignee: Standard Railway Equipment Manufacturing Co
•
Filing: 1946-11-29
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Granted: 1951-02-06
•
Expires: 1966-11-29
Abstract
No abstract record available.
Inventors
- 👤 Karl T Nystrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:37
CPC Classifications
B; B61; B61D; B61D19/00; B61D19/003; B61D19/005; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0911; Y10T292/0937; Y10T292/0938; Y10T292/0944; Y10T292/1043; Y10T292/1075; Y10T292/1083; Y10T292/1092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1022872A
Cited
US1809697A
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US1896636A
Cited
US1898583A
Cited
US2275707A
Cited
US2261600A
Cited
US2263480A
Cited
US2344903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |