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US2713773A
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Hydraulic pit prop or jack
Assignee: DOWTY AUTO UNITS Ltd
•
Filing: 1954-09-20
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Granted: 1955-07-26
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Expires: 1974-09-20
Abstract
No abstract record available.
Inventors
- 👤 Dudley G Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:57
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/14; E21D15/15; E21D15/155; E21D15/44; E21D15/45; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/87378
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2621631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-25 | 1959-01-24 | 1959-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-25 | 1963-01-24 | 1963-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-25 | 1967-01-24 | 1967-07-26 | $7700.00 | Window Closed / Lapsed |