Patent US3012546A successfully refreshed from Google Patents.
US3012546A
Expired / Lapsed
US
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Hydraulic props, particularly pit props
Assignee: Phoenix AG
•
Filing: 1959-05-08
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Granted: 1961-12-12
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Expires: 1979-05-08
Abstract
No abstract record available.
Inventors
- 👤 Heintzmann Hans Friedrich
- 👤 Selz Rudolf
- 👤 Blenkle Erwin
- 👤 Lerbs Hellmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:05
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/06; E; E21; E21D; E21D15/00; E21D15/14; E21D15/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1492158A
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US1928368A
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US2671470A
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US2673573A
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US2895494A
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US2949895A
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US2914089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |