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US3172340A
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Hydraulically operable mine prop
Assignee: Bochumer Eisenhuette Heintzmann GmbH and Co KG
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Filing: 1962-12-04
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Granted: 1965-03-09
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Expires: 1982-12-04
Abstract
No abstract record available.
Inventors
- 👤 Blenkle Erwin Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:24
CPC Classifications
E; E21; E21D; E21D15/00; E21D15/14; E21D15/44; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32631
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A HYDRAULIC MINE PROP COMPRISING, IN COMBINATION, AN EXTERNAL TUBULAR PROP MEMBER HAVING AN AXIS AND BEING CLOSED AT ONE END; AN INTERNAL PROP MEMBER HAVING AN END PORTION PROJECTING WITH CLEARANCE INTO SAID EXTERNAL PROP MEMBER AND BEING MOVABLE TOWARDS AND AWAY FROM SAID CLOSED END OF SAID EXTERNAL PROP MEMBER; A PROP PISTON AT THE INNER END OF SAID INTERNAL PROP MEMBER AND SEALING LY ENGAGING THE INNER SURFACE OF SAID EXTERNAL PROP MEMBER TO FORM THEREWITH BETWEEN SAID PISTON AND SAID CLOSED END A PRESSURE CHAMBER; CONNECTING MEANS FOR CONNECTING SAID PISTON AND SAID INNER END OF SAID INTERNAL PROP MEMBER FOR SIMULTANEOUS MOVEMENT TOWARD AND AWAY FROM SAID CLOSED END AND FOR LIMITED UNIVERSAL TILTING MOVEMENT RELATIVE TO EACH OTHER; AND MEANS FOR FEEDING PRESSURE FLUID INTO AND OUT OF SAID PRESSURE CHAMBER.
Claim 2
Dependent Claim
137 words
A HYDRAULIC MINE PROP COMPRISING, IN COMBINATION, AN EXTERNAL TUBULAR PROP MEMBER HAVING AN AXIS AND BEING CLOSED AT ONE END; AN INTERNAL PROP MEMBER HAVING AN END PORTION PROJECTING WITH CLEARANCE INTO SAID EXTERNAL PROP MEMBER AND BEING MOVABLE TOWARDS AND AWAY FROM SAID CLOSED END OF SAID EXTERNAL PROP MEMBER; A PROP PISTON AT THE INNER END OF SAID INTERNAL PROP MEMBER AND SEALING LY ENGAGING THE INNER SURFACE OF SAID EXTERNAL PROP MEMBER TO FORM THEREWITH BETWEEN SAID PISTON AND SAID CLOSED END A PRESSURE CHAMBER; CONNECTING MEANS FOR CONNECTING SAID PISTON AND SAID INNER END OF SAID INTERNAL PROP MEMBER FOR SIMULTANEOUS MOVEMENT TOWARD AND AWAY FROM SAID CLOSED END AND FOR LIMITED UNIVERSAL TILTING MOVEMENT RELATIVE TO EACH OTHER; AND MEANS FOR FEEDING PRESSURE FLUID INTO AND OUT OF SAID PRESSURE CHAMBER.
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) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |