Patent US3198087A successfully refreshed from Google Patents.
US3198087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roof support assemblies
Assignee: Dowty Mining Equipment Ltd
•
Filing: 1963-08-26
•
Granted: 1965-08-03
•
Expires: 1983-08-26
Abstract
No abstract record available.
Inventors
- 👤 Potts Michael Charles
- 👤 Bolton Douglas Herbert Hewlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:11
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/16; E21D23/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A ROOF SUPPORT ASSEMBLY FOR USE IN MINES, INCLUDING A SERIES OF ROOF SUPPORTS ADVANCEABLE IN A PREDETERMINED SEQUENCE, MEANS OPERATIVELY CONNECTED TO EACH ROOF SUPPORT TO ADVANCE THE SAME, CONTROL MEANS OPERABLE TO SEND A SIGNAL TO THE FIRST ROOF SUPPORT IN THE SEQUENCE TO INITIATE THE ADVANCE OF SAID FIRST ROOF SUPPORT, A SIGNALING MEANS OPERATIVELY ASSOCIATED WITH EACH ROOF SUPPORT, AND OPERABLE UPON COMPLETION OF THE ADVANCE OF ITS ROOF SUPPORT TO SEND A SIGNAL TO THE NEXT ROOF SUPPORT, SAID AND SO TO INITIATE ADVANCE OF SAID NEXT ROOF SUPPORT, SAID CONTROL MEANS INCLUDING A SIGNAL SOURCE AND A CUT-OFF DEVICE OPERABLE TO ISOLATE THE SIGNAL SOURCE FROM SAID FIRST ROOF SUPPORT, LOCKING MEANS FOR LOCKING THE CUT-OFF DEVICE IN THE ISOLATING POSITION INDEPENDENTLY OF A FUTURE LOSS OF A SIGNAL FROM THE SIGNAL SOURCE, AND RELEASE MEANS OPERABLE TO RELEASE SAID LOCKING MEANS.
Claim 2
Dependent Claim
148 words
A ROOF SUPPORT ASSEMBLY FOR USE IN MINES, INCLUDING A SERIES OF ROOF SUPPORTS ADVANCEABLE IN A PREDETERMINED SEQUENCE, MEANS OPERATIVELY CONNECTED TO EACH ROOF SUPPORT TO ADVANCE THE SAME, CONTROL MEANS OPERABLE TO SEND A SIGNAL TO THE FIRST ROOF SUPPORT IN THE SEQUENCE TO INITIATE THE ADVANCE OF SAID FIRST ROOF SUPPORT, A SIGNALING MEANS OPERATIVELY ASSOCIATED WITH EACH ROOF SUPPORT, AND OPERABLE UPON COMPLETION OF THE ADVANCE OF ITS ROOF SUPPORT TO SEND A SIGNAL TO THE NEXT ROOF SUPPORT, SAID AND SO TO INITIATE ADVANCE OF SAID NEXT ROOF SUPPORT, SAID CONTROL MEANS INCLUDING A SIGNAL SOURCE AND A CUT-OFF DEVICE OPERABLE TO ISOLATE THE SIGNAL SOURCE FROM SAID FIRST ROOF SUPPORT, LOCKING MEANS FOR LOCKING THE CUT-OFF DEVICE IN THE ISOLATING POSITION INDEPENDENTLY OF A FUTURE LOSS OF A SIGNAL FROM THE SIGNAL SOURCE, AND RELEASE MEANS OPERABLE TO RELEASE SAID LOCKING MEANS.
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 |