US2577040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine car sealing device
Assignee: Sanford Investment Co
•
Filing: 1947-04-07
•
Granted: 1951-12-04
•
Expires: 1967-04-07
Abstract
No abstract record available.
Inventors
- 👤 Hugh W Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:43
CPC Classifications
B; B61; B61D; B61D7/00; B61D7/14; B61D7/16; B61D7/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US987877A
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US990380A
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US1108327A
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US1762667A
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US1851214A
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US1826367A
Cited
US1955868A
Cited
US2399708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-03 | 1955-06-04 | 1955-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-03 | 1959-06-04 | 1959-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-03 | 1963-06-04 | 1963-12-04 | $7700.00 | Window Closed / Lapsed |