Patent US1748495A successfully refreshed from Google Patents.
Patent US843559A successfully refreshed from Google Patents.
US843559A
Expired / Lapsed
US
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Safety device for hopper-car doors.
Assignee: STANDARD STEEL CAR CO
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Filing: 1906-11-10
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Granted: 1907-02-05
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Expires: 1926-11-10
Abstract
No abstract record available.
Inventors
- 👤 Andrew Christianson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:19
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16
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) | 1910-02-04 | 1910-08-06 | 1911-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-02-04 | 1914-08-06 | 1915-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-02-04 | 1918-08-06 | 1919-02-05 | $7700.00 | Window Closed / Lapsed |