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US3348381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal face support systems
Assignee: Individual
•
Filing: 1965-02-15
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Granted: 1967-10-24
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Expires: 1985-02-15
Abstract
No abstract record available.
Inventors
- 👤 Jacobi Oskar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:34
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/006; E21D23/0065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
197 words
A METHOD OF AUTOMATICALLY AND SUCCESSIVELY ADVANCING THROUGH A PREDETERMINED DISTANCE INDIVIDUAL SUPPORT UNITS OF A MINE ROOF SUPPORT SYSTEM WHICH ARE ASSOCIATED TOGETHER IN GROUPS, THE GROUPS BEING CONTROLLED BY A GROUP CONTROL MEANS, AND WHEREIN THE INDIVIDUAL SUPPORT UNITS WITHIN EACH GROUP ARE CONTROLLED BY UNIT CONTROL MEANS, COMPRISING TRANSMITTING A SIGNAL FROM THE GROUP CONTROL MEANS TO THE UNIT CONTROL MEANS OF EACH GROUP WHICH IS SPACED THE PREDETERMINED DISTANCE FROM THE WORKING FACE, WHEREBY THE UNIT CONTROL SYSTEMS ARE ACTUATED UPON THE LOCALIZED SENSING OF THE PREDETERMINED DISTANCE RATHER THAN SEQUENTIALLY, EACH OF SAID ACTUATED UNIT CONTROL MEANS TRANSMITTING A SIGNAL TO A FIRST ONE OF ITS INDIVIDUAL ROOF SUPPORT UNITS, RELIEVING THE FIRST SUPPORT UNIT OF ITS ROOFSUPPORTING PRESSURE, ADVANCING THE FIRST SUPPORT THROUGH THE PREDETERMINED DISTANCE, TRIGGERING THE UNIT CONTROL MEANS, RESETTING THE FIRST UNIT UNDER ITS ROOF-SUPPORTING PRESSURE, RELIEVING THE SECOND ONE OF THE INDIVIDUAL ROOF SUPPORT UNITS OF ITS ROOF-SUPPORTING PRESSURE, THE UNIT CONTROL MEANS RELAYING CONTROL SIGNALS FROM UNIT TO UNIT UNTIL THE LAST UNIT IS REACHED WHEREUPON THE FIRST UNIT AGAIN BECOMES THE CONTROLLING UNIT AND IS REACTUATED UPON A SUBSEQUENT SIGNAL FROM THE GROUP CONTROL MEANS.
Claim 2
Independent Claim
197 words
A METHOD OF AUTOMATICALLY AND SUCCESSIVELY ADVANCING THROUGH A PREDETERMINED DISTANCE INDIVIDUAL SUPPORT UNITS OF A MINE ROOF SUPPORT SYSTEM WHICH ARE ASSOCIATED TOGETHER IN GROUPS, THE GROUPS BEING CONTROLLED BY A GROUP CONTROL MEANS, AND WHEREIN THE INDIVIDUAL SUPPORT UNITS WITHIN EACH GROUP ARE CONTROLLED BY UNIT CONTROL MEANS, COMPRISING TRANSMITTING A SIGNAL FROM THE GROUP CONTROL MEANS TO THE UNIT CONTROL MEANS OF EACH GROUP WHICH IS SPACED THE PREDETERMINED DISTANCE FROM THE WORKING FACE, WHEREBY THE UNIT CONTROL SYSTEMS ARE ACTUATED UPON THE LOCALIZED SENSING OF THE PREDETERMINED DISTANCE RATHER THAN SEQUENTIALLY, EACH OF SAID ACTUATED UNIT CONTROL MEANS TRANSMITTING A SIGNAL TO A FIRST ONE OF ITS INDIVIDUAL ROOF SUPPORT UNITS, RELIEVING THE FIRST SUPPORT UNIT OF ITS ROOFSUPPORTING PRESSURE, ADVANCING THE FIRST SUPPORT THROUGH THE PREDETERMINED DISTANCE, TRIGGERING THE UNIT CONTROL MEANS, RESETTING THE FIRST UNIT UNDER ITS ROOF-SUPPORTING PRESSURE, RELIEVING THE SECOND ONE OF THE INDIVIDUAL ROOF SUPPORT UNITS OF ITS ROOF-SUPPORTING PRESSURE, THE UNIT CONTROL MEANS RELAYING CONTROL SIGNALS FROM UNIT TO UNIT UNTIL THE LAST UNIT IS REACHED WHEREUPON THE FIRST UNIT AGAIN BECOMES THE CONTROLLING UNIT AND IS REACTUATED UPON A SUBSEQUENT SIGNAL FROM THE GROUP CONTROL 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) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |