US3097829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof support in mines
Assignee: Gullick Ltd
•
Filing: 1960-01-12
•
Granted: 1963-07-16
•
Expires: 1980-01-12
Abstract
No abstract record available.
Inventors
- 👤 Seddon Jeffrey William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:43
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0052
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
IN COMBINATION WITH A COAL CONVEYOR, A SELF-ADVANCING MINE ROOF SUPPORT LOCATED ON ONE SIDE OF SAID CONVEYOR AND COMPRISING TWO SUPPORT MEMBERS POSITIONED IN SIDE-BY-SIDE RELATIONSHIP AND MOVABLE INDEPENDENTLY TOWARDS THE CONVEYOR AND EACH HAVING HYDRAULICALLY EXTENSIBLE PROP MEANS WHEREBY IT CAN BE SECURED BETWEEN FLOOR AND ROOF, A PAIR OF HYDRAULIC RAM CYLINDERS, MEANS SECURING ONE OF SAID RAM CYLINDERS TO EACH SUPPORT MEMBERS, A RAM PROPER WORKING IN EACH OF SAID RAM CYLINDERS AND DIRECTED FOR MOVEMENT TOWARDS AND AWAY FROM SAID CONVEYOR, AN ANCHORAGE ON THE CONVEYOR OPPOSITE SAID RAMS PROPER, AND A FLEXIBLE MEMBER CONNECTING THE TWO RAMS PROPER TOGETHER AND LOOPED AROUND SAID ANCHORAGE AND HAVING A LENGTH EQUAL TO THE DISTANCE FROM THE FORWARD ENDS OF THE RAMS PROPER EXTENDING ABOUT THE ANCHORAGE.
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) | 1966-07-15 | 1967-01-14 | 1967-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-15 | 1971-01-14 | 1971-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-15 | 1975-01-14 | 1975-07-16 | $7700.00 | Window Closed / Lapsed |