US3948057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable mine stopping device
Assignee: Lee Raymond Organization Inc
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Filing: 1975-02-24
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Granted: 1976-04-06
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Expires: 1995-02-24
Abstract
Abstract A ribbed sheet of flowable material is positionable on the sides and roof of an air passage of a mine for sealing irregularities in the sides and roof and extends across the air passage to prevent the flow of air therealong. A plurality of air cells are positioned in closely adjacent relation within the confines of the sheet and are inflatable to block the flow of air through the passage.
Inventors
- 👤 Hugo Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:56
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/103; E21F17/107
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
90 words
A portable mine stopping device for blocking an air passage of a mine, said mine stopping device comprising A ribbed sheet of flowable material positionable on the sides and roof of an air passage of a mine for sealing irregularities in the sides and roof and extending across the air passage to prevent the flow of air therealong; and A plurality of air cells positioned in closely adjacent relation within the confines of the sheet, said air cells being inflatable to substantially block the flow of air through the passage.
Claim 2
Dependent Claim
90 words
A portable mine stopping device for blocking an air passage of a mine, said mine stopping device comprising A ribbed sheet of flowable material positionable on the sides and roof of an air passage of a mine for sealing irregularities in the sides and roof and extending across the air passage to prevent the flow of air therealong; and A plurality of air cells positioned in closely adjacent relation within the confines of the sheet, said air cells being inflatable to substantially block the flow of air through the passage.
Claim 3
Dependent Claim
39 words
A portable mine stopping as claimed in claim 1, wherein the air cells are interconnected by ducts and at least one of the air cells has valve means for supplying air thereto and to the other air cells therethrough.
References Cited (Backward Citations)
US2729064A
Cited
US3831318A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |