US3320001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-advancing mine roof supports and control means therefor
Assignee: Gullick Ltd
•
Filing: 1965-01-18
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Granted: 1967-05-16
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Expires: 1985-01-18
Abstract
No abstract record available.
Inventors
- 👤 Archelaius D Allen
- 👤 Ward Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/12; E21D23/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A SERIES OF SELF-ADVANCING MINE ROOF SUPPORTS IN SIDE-BY-SIDE RELATIONSHIP FOR SUPPORTING A MINE ROOF IN THE VICINITY OF THE PATH OF MOVEMENT OF A MINERAL CUTTING MACHINE ALONG THE MINERAL FACE, EACH OF SAID SUPPORTS HAVING IN COMBINATION A PRESSURE-FLUID RAM MEANS FOR ADVANCING IT AFTER THE CUTTING MACHINE HAS PASSED, A SOLENOID-OPERATED CONTROL VALVE FOR SAID RAM MEANS, A SEQUENCE RELAY IN THE SOLENOID CIRCUIT OF SAID VALVE, MEANS FOR ACTUATING SAID SEQUENCE RELAY BY RE-POSITIONING OF A PRECEDING SUPPORT IN THE SERIES, A MEMORY RELAY IN THE SOLENOID CIRCUIT OF SAID VALVE, AND A PHOTO-ELECTRIC ENERGISING CIRCUIT FOR SAID MEMORY RELAY INCLUDING A PHOTO-CELL POSITIONED TO BE ENERGISED BY A LIGHT SOURCE ON A MINERAL CUTTING MACHINE AS IT PASSES THE SUPPORT, WHEREBY A SUPPORT CANNOT BE ADVANCED UNTIL A PRECEDING SUPPORT HAS BEEN RE-POSITIONED AND THE CUTTING MACHINE HAS PASSED.
Claim 2
Dependent Claim
144 words
A SERIES OF SELF-ADVANCING MINE ROOF SUPPORTS IN SIDE-BY-SIDE RELATIONSHIP FOR SUPPORTING A MINE ROOF IN THE VICINITY OF THE PATH OF MOVEMENT OF A MINERAL CUTTING MACHINE ALONG THE MINERAL FACE, EACH OF SAID SUPPORTS HAVING IN COMBINATION A PRESSURE-FLUID RAM MEANS FOR ADVANCING IT AFTER THE CUTTING MACHINE HAS PASSED, A SOLENOID-OPERATED CONTROL VALVE FOR SAID RAM MEANS, A SEQUENCE RELAY IN THE SOLENOID CIRCUIT OF SAID VALVE, MEANS FOR ACTUATING SAID SEQUENCE RELAY BY RE-POSITIONING OF A PRECEDING SUPPORT IN THE SERIES, A MEMORY RELAY IN THE SOLENOID CIRCUIT OF SAID VALVE, AND A PHOTO-ELECTRIC ENERGISING CIRCUIT FOR SAID MEMORY RELAY INCLUDING A PHOTO-CELL POSITIONED TO BE ENERGISED BY A LIGHT SOURCE ON A MINERAL CUTTING MACHINE AS IT PASSES THE SUPPORT, WHEREBY A SUPPORT CANNOT BE ADVANCED UNTIL A PRECEDING SUPPORT HAS BEEN RE-POSITIONED AND THE CUTTING MACHINE HAS PASSED.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |