Patent US2237299A successfully refreshed from Google Patents.
US2237299A
Expired / Lapsed
US
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Hopper bottom car
Assignee: WESTERN AUSTIN Co
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Filing: 1937-08-16
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Granted: 1941-04-08
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Expires: 1957-08-16
Abstract
No abstract record available.
Inventors
- 👤 James D Benbow
- 👤 George W Sines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:58
CPC Classifications
B; B60; B60P; B60P1/00; B60P1/56; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/24; B61D7/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1944-04-07 | 1944-10-07 | 1945-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-04-07 | 1948-10-07 | 1949-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-04-07 | 1952-10-07 | 1953-04-08 | $7700.00 | Window Closed / Lapsed |