Patent US2445543A successfully refreshed from Google Patents.
US2445543A
Expired / Lapsed
US
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Mine prop
Assignee: Individual
•
Filing: 1945-09-07
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Granted: 1948-07-20
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Expires: 1965-09-07
Abstract
No abstract record available.
Inventors
- 👤 Thines Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:47
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/50; E21D15/502; E21D15/14; E21D15/28; E21D15/40; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32467; Y10T403/32475; Y10T403/32483
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1575818A
Cited
US2297469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-07-20 | 1952-01-19 | 1952-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-07-20 | 1956-01-19 | 1956-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-07-20 | 1960-01-19 | 1960-07-20 | $7700.00 | Window Closed / Lapsed |