US3197966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof supporting means for mines
Assignee: Gullick Ltd
•
Filing: 1961-02-14
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Granted: 1965-08-03
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Expires: 1981-02-14
Abstract
No abstract record available.
Inventors
- 👤 Arnott Leslie John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:55
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/0047; E21D23/0052; E21D23/006; E21D23/0069; E21F; E21F13/00; E21F13/08; E21F13/086
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A SELF-ADVANCING MINE ROOF SUPPORT COMPRISING A PAIR OF ROOF SUPPORT UNITS EACH HAVING A BASE AND DISPOSED ONE BEHIND THE OTHER FOR LOCATION ADJACENT A CONVEYOR, A FLUID PRESSURE ADVANCING RAM OPERATIVELY CONNECTED TO THE BASE OF ONE OF SAID UNITS AND ADAPTED TO BE CONNECTED TO SAID CONVEYOR TO INDEPENDENTLY ADVANCE THE CONVEYOR AND THE UNITS AS A PAIR, AND RIGID LINK MEANS OF CONSTANT LENGTH HINGEDLY CONNECTING THE BASE OF THE REAR UNIT TO THE BASE OF THE FORWARD UNIT SO AS TO PERMIT STEP-LIKE ELEVATION OF ONE BASE WITH RESPECT TO THE OTHER AND TO TRANSMIT A FORWARD THRUST EXERCISED BY SAID ADVANCING RAM FROM SAID ONE BASE TO WHICH IT IS CONNECTED TO THE OTHER BASE TO ADVANCE BOTH UNITS TOGETHER.
Claim 2
Dependent Claim
126 words
A SELF-ADVANCING MINE ROOF SUPPORT COMPRISING A PAIR OF ROOF SUPPORT UNITS EACH HAVING A BASE AND DISPOSED ONE BEHIND THE OTHER FOR LOCATION ADJACENT A CONVEYOR, A FLUID PRESSURE ADVANCING RAM OPERATIVELY CONNECTED TO THE BASE OF ONE OF SAID UNITS AND ADAPTED TO BE CONNECTED TO SAID CONVEYOR TO INDEPENDENTLY ADVANCE THE CONVEYOR AND THE UNITS AS A PAIR, AND RIGID LINK MEANS OF CONSTANT LENGTH HINGEDLY CONNECTING THE BASE OF THE REAR UNIT TO THE BASE OF THE FORWARD UNIT SO AS TO PERMIT STEP-LIKE ELEVATION OF ONE BASE WITH RESPECT TO THE OTHER AND TO TRANSMIT A FORWARD THRUST EXERCISED BY SAID ADVANCING RAM FROM SAID ONE BASE TO WHICH IT IS CONNECTED TO THE OTHER BASE TO ADVANCE BOTH UNITS TOGETHER.
References Cited (Backward Citations)
GB786331A
Cited
GB773407A
Cited
FR1164448A
Cited
GB854967A
Cited
US2910281A
Cited
FR1192850A
Cited
FR1197458A
Cited
FR1211437A
Cited
FR1250713A
Cited
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 |