Patent US3977312A successfully refreshed from Google Patents.
US3977312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parachute stopping for mine ventilation use
Assignee: United States Department of the Interior
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Filing: 1975-10-31
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Granted: 1976-08-31
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Expires: 1995-10-31
Abstract
Abstract A parachute-type mine stopping used in ventilation control comprises a parachute-like canopy suspended from straps or lines secured to a roof bolt or the like. After the lines are so secured, the stopping is erected by merely lifting the upper edge of the canopy into the airstream in the passage, the airstream causing the canopy to simply "pop" into place. In a preferred embodiment, a skirt is sewn to the peripheral edge of the canopy to improve sealing.
Inventors
- 👤 Fred N. Kissell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:06
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/103
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A mine stopping for controlling air ventilation in a mine passage, said stopping comprising a parachute-type substantially air impermeable canopy, constructed of an air impermeable material, for, when erected, blocking the mine passage in which the canopy is located, a plurality of lines secured at one end thereof at spaced locations near the peripheral edge of the canopy, and means, connected to said lines at the other ends thereof, for securing said lines to a fixed point within the passage in which the canopy is located.
Claim 2
Dependent Claim
86 words
A mine stopping for controlling air ventilation in a mine passage, said stopping comprising a parachute-type substantially air impermeable canopy, constructed of an air impermeable material, for, when erected, blocking the mine passage in which the canopy is located, a plurality of lines secured at one end thereof at spaced locations near the peripheral edge of the canopy, and means, connected to said lines at the other ends thereof, for securing said lines to a fixed point within the passage in which the canopy is located.
Claim 3
Dependent Claim
29 words
A mine stopping as claimed in claim 1 further comprising a skirt attached along one edge to the peripheral edge of said canopy and extending outwardly from said canopy.
Claim 4
Dependent Claim
15 words
A mine stopping as claimed in claim 1 wherein said canopy is hemispherical in shape.
Claim 5
Dependent Claim
15 words
A mine stopping as claimed in claim 1 wherein said canopy is conical in shape.
Claim 6
Dependent Claim
15 words
A mine stopping as claimed in claim 2 wherein said canopy is conical in shape.
Claim 7
Dependent Claim
25 words
A mine stopping as claimed in claim 1 wherein the perimeter of the canopy is approximately 150% of that of the perimeter of the passage.
Claim 8
Independent Claim
86 words
A method of stopping a mine passage to control mine ventilation using a parachute-type stopping comprising a substantially air impermeable parachute canopy and a plurality of lines connected thereto, said method comprising arranging the parachute canopy underside faces in the direction of the airflow in the passage, securing the ends of the lines connected to the parachute canopy to a fixed point on the passage wall, and raising the parachute canopy when the canopy is filled by the air flow and is erected in place thereby.
Claim 9
Independent Claim
86 words
A method of stopping a mine passage to control mine ventilation using a parachute-type stopping comprising a substantially air impermeable parachute canopy and a plurality of lines connected thereto, said method comprising arranging the parachute canopy underside faces in the direction of the airflow in the passage, securing the ends of the lines connected to the parachute canopy to a fixed point on the passage wall, and raising the parachute canopy when the canopy is filled by the air flow and is erected in place thereby.
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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |