US3409134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration process with scraping and blow-back cake removal
Assignee: Dorr Oliver Inc
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Filing: 1965-10-22
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Granted: 1968-11-05
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Gordon C Wallace
- 👤 Leon D Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:18
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/44; B01D33/46; B01D33/466; B01D33/48; B01D33/80; B01D33/804; B01D2201/00; B01D2201/28; B01D2201/282
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE METHOD OF CONTINUOUSLY FILTERING AN AQUEOUS SLURRY OF FINELY DIVIDED MINERAL PARTICLES BY MEANS OF A FILTER HAVING A TANK HOLDING A POOL OF SLURRY AND A ROTATING FILTER HAVING CIRCULARLY ARRANGED HOLLOW FILTER SECTIONS, THE LOWER PORTION OF WHICH FILTER PASSES THROUGH SAID POOL AND HAS VACUUM AND BLOW MEANS OPERATIVELY CONNECTED TO SAID SECTIONS, WHICH COMPRISES THE STEPS OF CONTINUOUSLY ROTATING SAID FILTER THROUGH SAID TANK UNDER SUCTION TO APPLY 1/2 TO 1 1/2 INCHES OF FILTER CAKE ON SAID FILTER SECTIONS OF WHICH THERE IS A COMPARATIVELY WET LAYER NEXT TO THE SURFACE OF THE SECTION AND A COMPARATIVELY DRY LAYER ABOVE SAID WET LAYER, SCRAPING OFF ALL EXCEPT 1/16-1/4 INCH OF THE FILTER CAKE WHILE MAINTAINING SUCTION THEREON AND THEREAFTER BLOWING AND SEPARATELY DISCHARGING THE WET LAYER, WHEREBY THE SCRAPED MATERIAL CONSTITUTES A FILTER CAKE OF INCREASED DRYNESS.
Claim 2
Independent Claim
143 words
THE METHOD OF CONTINUOUSLY FILTERING AN AQUEOUS SLURRY OF FINELY DIVIDED MINERAL PARTICLES BY MEANS OF A FILTER HAVING A TANK HOLDING A POOL OF SLURRY AND A ROTATING FILTER HAVING CIRCULARLY ARRANGED HOLLOW FILTER SECTIONS, THE LOWER PORTION OF WHICH FILTER PASSES THROUGH SAID POOL AND HAS VACUUM AND BLOW MEANS OPERATIVELY CONNECTED TO SAID SECTIONS, WHICH COMPRISES THE STEPS OF CONTINUOUSLY ROTATING SAID FILTER THROUGH SAID TANK UNDER SUCTION TO APPLY 1/2 TO 1 1/2 INCHES OF FILTER CAKE ON SAID FILTER SECTIONS OF WHICH THERE IS A COMPARATIVELY WET LAYER NEXT TO THE SURFACE OF THE SECTION AND A COMPARATIVELY DRY LAYER ABOVE SAID WET LAYER, SCRAPING OFF ALL EXCEPT 1/16-1/4 INCH OF THE FILTER CAKE WHILE MAINTAINING SUCTION THEREON AND THEREAFTER BLOWING AND SEPARATELY DISCHARGING THE WET LAYER, WHEREBY THE SCRAPED MATERIAL CONSTITUTES A FILTER CAKE OF INCREASED DRYNESS.
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) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |