US3169377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Base for mine props and the like
Assignee: Gewerkschaft Eisenhutte Westfalia GmbH
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Filing: 1961-03-28
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Granted: 1965-02-16
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Expires: 1981-03-28
Abstract
No abstract record available.
Inventors
- 👤 Hoffmann Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:50
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/006; E21D23/0073; E21D23/08; E21D23/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
ADVANCEABLE MINE PROP BASE ARRANGEMENT WHICH COMPRISES A PAIR OF FLEXIBLE SKID MEMBERS EACH ADAPTED TO SUPPORT MINE PROP ROOF BEARING MEANS, A ROD FOR EACH SKID MEMBER, AN ARM AT EACH END OF THE SKID MEMBERS RIGIDLY SUPPORTING THE RODS IN PARALLEL SPACED RELATION TO THE SKID MEMBERS, A PAIR OF CYLINDERS ON SAID RODS AND A PAIR OF DOUBLE ACTING PISTONS OPERATIVELY DISPOSED IN SAID CYLINDERS ON SAID RODS INTERMEDIATE THE ENDS OF SAID RODS, THE ENDS OF EACH ROD EXTENDING THROUGH THE ENDS OF EACH CYLINDER, MEANS CONNECTING SAID CYLINDERS TOGETHER IN STAGGERED ENDWISE FIXED RELATION TO EACH OTHER TO MAINTAIN SAID RODS PARALLEL TO EACH OTHER AND TO PERMIT SAID CYLINDERS TO MOVE SAID RODS LONGITUDINALLY AN ADDITIVE LONGITUDINAL DISTANCE SUBSTANTIALLY EQUAL TO THE LENGTH OF ONE ROD FROM A STARTING POSITION WHERE BOTH RODS ARE SIDE BY SIDE.
Claim 2
Dependent Claim
143 words
ADVANCEABLE MINE PROP BASE ARRANGEMENT WHICH COMPRISES A PAIR OF FLEXIBLE SKID MEMBERS EACH ADAPTED TO SUPPORT MINE PROP ROOF BEARING MEANS, A ROD FOR EACH SKID MEMBER, AN ARM AT EACH END OF THE SKID MEMBERS RIGIDLY SUPPORTING THE RODS IN PARALLEL SPACED RELATION TO THE SKID MEMBERS, A PAIR OF CYLINDERS ON SAID RODS AND A PAIR OF DOUBLE ACTING PISTONS OPERATIVELY DISPOSED IN SAID CYLINDERS ON SAID RODS INTERMEDIATE THE ENDS OF SAID RODS, THE ENDS OF EACH ROD EXTENDING THROUGH THE ENDS OF EACH CYLINDER, MEANS CONNECTING SAID CYLINDERS TOGETHER IN STAGGERED ENDWISE FIXED RELATION TO EACH OTHER TO MAINTAIN SAID RODS PARALLEL TO EACH OTHER AND TO PERMIT SAID CYLINDERS TO MOVE SAID RODS LONGITUDINALLY AN ADDITIVE LONGITUDINAL DISTANCE SUBSTANTIALLY EQUAL TO THE LENGTH OF ONE ROD FROM A STARTING POSITION WHERE BOTH RODS ARE SIDE BY SIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-16 | 1968-08-17 | 1969-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-16 | 1972-08-17 | 1973-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-16 | 1976-08-17 | 1977-02-16 | $7700.00 | Window Closed / Lapsed |