Patent US3197965A successfully refreshed from Google Patents.
US3197965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-advancing mine roof supports
Assignee: ELECTRO HYDRAULIES Ltd
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Filing: 1961-01-10
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Granted: 1965-08-03
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Expires: 1981-01-10
Abstract
No abstract record available.
Inventors
- 👤 Lee Roger Demant
- 👤 Harold Robert Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:45
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
159 words
A MIND ROOF SUPPORT FOR USE IN A MINE HAVING AN ANCHORAGE THEREIN, SAID SUPPORT COMPRISING TWO ALTERNATELY ADVANCEABLE FRAMES, EACH SAID FRAME INCLUDING A FLOOR SKID, A ROOF BAR, AND AMEANS FOR CAUSING MOVEMENT OF SAID FLOOR SKID AND SAID ROOF BAR TOWARDS AND AWAY FROM ONE ANOTHER SO AS RESPECTIVELY TO RELEASE AND TO SECURE SAID FRAMES FROM OR IN AN OPERATIVE POSITION SAID FLOOR AND ROOF OF THE MINE IN WHICH OPERATIVE POSITION SAID FRAME IS HELD STATIONARY BY ENGAGEMENT OF ITS FLOOR SKID AND ROOF BAR RESPECTIVELY WITH THE FLOOR AND ROOF OF THE MINE; A DUBLE ACTING HYDRAULIC RAM HAVING A CYLINDER ELEMENT AND A PISTON ROD ELEMENT; MEANS MOUNTING SAID FRAMES TO SLIDE RELATIVELY TO ONE ANOTHER IN SPACED PARALLEL RELATIONSHIP TOWARD AND FROM SAID ANCHORAGE AND CONNECTING SAID FRAMES TO ONE OF SAID ELEMENTS FOR MOVEMENTS RELATIVE THERETO; MEANS FOR OPERATIVELY CONNECTING THE OTHER OF SAID ELEMENTS TO SAID ANCHORAGE; AND MOTION
Claim 2
Dependent Claim
159 words
A MIND ROOF SUPPORT FOR USE IN A MINE HAVING AN ANCHORAGE THEREIN, SAID SUPPORT COMPRISING TWO ALTERNATELY ADVANCEABLE FRAMES, EACH SAID FRAME INCLUDING A FLOOR SKID, A ROOF BAR, AND AMEANS FOR CAUSING MOVEMENT OF SAID FLOOR SKID AND SAID ROOF BAR TOWARDS AND AWAY FROM ONE ANOTHER SO AS RESPECTIVELY TO RELEASE AND TO SECURE SAID FRAMES FROM OR IN AN OPERATIVE POSITION SAID FLOOR AND ROOF OF THE MINE IN WHICH OPERATIVE POSITION SAID FRAME IS HELD STATIONARY BY ENGAGEMENT OF ITS FLOOR SKID AND ROOF BAR RESPECTIVELY WITH THE FLOOR AND ROOF OF THE MINE; A DUBLE ACTING HYDRAULIC RAM HAVING A CYLINDER ELEMENT AND A PISTON ROD ELEMENT; MEANS MOUNTING SAID FRAMES TO SLIDE RELATIVELY TO ONE ANOTHER IN SPACED PARALLEL RELATIONSHIP TOWARD AND FROM SAID ANCHORAGE AND CONNECTING SAID FRAMES TO ONE OF SAID ELEMENTS FOR MOVEMENTS RELATIVE THERETO; MEANS FOR OPERATIVELY CONNECTING THE OTHER OF SAID ELEMENTS TO SAID ANCHORAGE; AND MOTION
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) | 1968-08-02 | 1969-02-01 | 1969-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-02 | 1973-02-01 | 1973-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-02 | 1977-02-01 | 1977-08-03 | $7700.00 | Window Closed / Lapsed |