Patent US3194443A successfully refreshed from Google Patents.
US3194443A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock duster
Assignee: American Mine Door Co
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Filing: 1963-07-01
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Granted: 1965-07-13
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Expires: 1983-07-01
Abstract
No abstract record available.
Inventors
- 👤 Glenn D Gurney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:19
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/08; E21F5/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A ROCK DUSTER COMPRISING A HOPPER HAVING SIDE WALLS, END WALLS AND A POROUS BOTTOM WALL, THERE BEING SPACED DISCHARGE OUTLETS IN ONE END WALL, A GAS CHAMBER BELOW AND COEXTENSIVE WITH THE BOTTOM WALL, MEANS FOR INTRODUCING A GASEOUS MEDIUM UNDER PRESSURE INTO SAID GAS CHAMBER, A TRANSVERSELY DISPOSED ROTARY FAN LOCATED IN FROM OF EACH DISCHARGE OUTLET, SPACED TRANSVERSE WALLS BETEEN WHICH THE FANS ARE LOCATED, THE SPACE BETWEEN SAID TRANSVERSE WALLS BEING UNOBSTRUCTED ABOVE EACH FAN AND AT OPPOSITE ENDS OF SAID TRANSVERSE WALLS, THERE BEING OPENINGS CONCENTRIC WITH THE FANS IN THE INNERMOST TRANSVERSE WALL, AND MEANS FOR ROTATING THE FANS, WHEREBY ROCK DUST WILL BE CONVEYED ALONG SAID POROUS BOTTOM WALL AND THROUGH SAID DISCHARGE OUTLETS AND DRAWN INTO SAID FANS AND WILL BE BLOWN UPWARDLY AND OUTWARDLY THEREBY FROM BETWEEN SAID TRANSVERSE WALLS.
Claim 2
Dependent Claim
139 words
A ROCK DUSTER COMPRISING A HOPPER HAVING SIDE WALLS, END WALLS AND A POROUS BOTTOM WALL, THERE BEING SPACED DISCHARGE OUTLETS IN ONE END WALL, A GAS CHAMBER BELOW AND COEXTENSIVE WITH THE BOTTOM WALL, MEANS FOR INTRODUCING A GASEOUS MEDIUM UNDER PRESSURE INTO SAID GAS CHAMBER, A TRANSVERSELY DISPOSED ROTARY FAN LOCATED IN FROM OF EACH DISCHARGE OUTLET, SPACED TRANSVERSE WALLS BETEEN WHICH THE FANS ARE LOCATED, THE SPACE BETWEEN SAID TRANSVERSE WALLS BEING UNOBSTRUCTED ABOVE EACH FAN AND AT OPPOSITE ENDS OF SAID TRANSVERSE WALLS, THERE BEING OPENINGS CONCENTRIC WITH THE FANS IN THE INNERMOST TRANSVERSE WALL, AND MEANS FOR ROTATING THE FANS, WHEREBY ROCK DUST WILL BE CONVEYED ALONG SAID POROUS BOTTOM WALL AND THROUGH SAID DISCHARGE OUTLETS AND DRAWN INTO SAID FANS AND WILL BE BLOWN UPWARDLY AND OUTWARDLY THEREBY FROM BETWEEN SAID TRANSVERSE WALLS.
References Cited (Backward Citations)
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Cited
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US2645500A
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US2813640A
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |