Patent US3395099A successfully refreshed from Google Patents.
US3395099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for backwashing mineral beds
Assignee: Individual
•
Filing: 1965-06-24
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Granted: 1968-07-30
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Expires: 1985-06-24
Abstract
No abstract record available.
Inventors
- 👤 Richard D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:25
CPC Classifications
B; B01; B01J; B01J49/00; B01J49/60
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
A METHOD OF TREATING LIQUID IN A TANK HAVING THEREIN A PARTICULATE MINERAL BED AND A RESERVOIR SPACE ABOVE THE TOP OF THE BED WITH MEANS FOR INTRODUCING LIQUID TO BE TREATED INTO SAID RESERVOIR SPACE AND MEANS FOR WITHDRAWING FROM THE LOWER PART OF THE BED TREATED LIQUID WHICH HAS FILTERED DOW THROUGH THE BED, AND WHEREIN FILTRATE MUST PERIODICALLY BE REMOVED FROM THE BED, THE STEPS COMPRISING: INJECTING A STREAM OF BACKWASHING LIQUID INTO A SCRUBBING TUBE; EJECTING MINERAL PARTICLES FROM THE BED INTO SAID STREAM AND WASHING THE PARTICLES IN SAID STREAM; AND DISCHARGING THE STREAM FROM THE SCRUBBING TUBE INTO THE MINERAL BED SUBSTANTIALLY BELOW SAID TOP OF THE MINERAL BED AND THEREBY RETURNING THE CLEANED MINERAL PARTICLES TO THE BED AND WASHING FILTRATE FROM THE BED INTO SAID RESERVOIR SPACE.
References Cited (Backward Citations)
US2902445A
Cited
US3317044A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-30 | 1972-01-29 | 1972-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-30 | 1976-01-29 | 1976-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-30 | 1980-01-29 | 1980-07-30 | $7700.00 | Window Closed / Lapsed |