Patent US3202058A successfully refreshed from Google Patents.
US3202058A
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Roof support assembly
Assignee: Dowty Mining Equipment Ltd
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Filing: 1964-11-20
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Granted: 1965-08-24
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Expires: 1984-11-20
Abstract
No abstract record available.
Inventors
- 👤 Bolton Douglas Herbert Hewlett
- 👤 Potts Michael Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:41
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/16; E21D23/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
A ROOF SUPPORT ASSEMBLY INCLUDING A SERIES OF ROOF SUPPORTS ADVANCEABLE IN A PREDETERMINED SEQUENCE, EACH ROOF SUPPORT INCLUDING SIGNALLING MENS OPERABLE TO SEND A SIGNAL TO THE NEXT ROOF SUPPORT IN THE SEQUENCE TO INITIATE THE ADVANCE OF SAID NEXT ROOF SUPPORT, EACH ROOF SUPPORT ALSO INCLUDING LOCKING MEANS FOR LOCKING THE SIGNALLING MEANS IN THE SIGNALLING POSITION IN A MANNER INDEPENDENT OF A FUTURE LOSS OF THE SIGNAL, AND THE ASSEMBLY ALSO INCLUDING RELEASE MEANS OPERABLE TO RELEASE THE LOCKING MEANS OF EACH ROOF SUPPORT.
Claim 2
Dependent Claim
87 words
A ROOF SUPPORT ASSEMBLY INCLUDING A SERIES OF ROOF SUPPORTS ADVANCEABLE IN A PREDETERMINED SEQUENCE, EACH ROOF SUPPORT INCLUDING SIGNALLING MENS OPERABLE TO SEND A SIGNAL TO THE NEXT ROOF SUPPORT IN THE SEQUENCE TO INITIATE THE ADVANCE OF SAID NEXT ROOF SUPPORT, EACH ROOF SUPPORT ALSO INCLUDING LOCKING MEANS FOR LOCKING THE SIGNALLING MEANS IN THE SIGNALLING POSITION IN A MANNER INDEPENDENT OF A FUTURE LOSS OF THE SIGNAL, AND THE ASSEMBLY ALSO INCLUDING RELEASE MEANS OPERABLE TO RELEASE THE LOCKING MEANS OF EACH ROOF SUPPORT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |