US2785123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for purifying water
Assignee: Tidewater Oil Co
•
Filing: 1953-02-02
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Granted: 1957-03-12
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Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Robert A Stroud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:10
CPC Classifications
C; C10; C10G; C10G33/00; C10G33/06; B; B01; B01D; B01D17/00; B01D17/02; B01D17/0205; B01D17/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD FOR PURIFYING WASTE WATER CONTAINING PETROLEUM AND OTHER DELETERIOUS SUBSTANCES FOR WHICH DOLOMITE HAS LESS AFFINITY THAN FOR WATER COMPRISING SERIALLY PASSING SAID WASTE WATER DOWNWARDLY THROUGH EACH OF A SERIES OF COARSELY AND MEDIUM COARSELY CRYSTALLINE DOLOMITE FILTER BEDS WHILE SIMULTANEOUSLY BUBBLING A RELATIVELY SLOW COUNTERCURRENT OF DIFFUSED AIR UPWARDLY THROUGH SAID BED AND SAID WATER, SO THAT THE IMPURITIES
Claim 2
Independent Claim
63 words
A METHOD FOR PURIFYING WASTE WATER CONTAINING PETROLEUM AND OTHER DELETERIOUS SUBSTANCES FOR WHICH DOLOMITE HAS LESS AFFINITY THAN FOR WATER COMPRISING SERIALLY PASSING SAID WASTE WATER DOWNWARDLY THROUGH EACH OF A SERIES OF COARSELY AND MEDIUM COARSELY CRYSTALLINE DOLOMITE FILTER BEDS WHILE SIMULTANEOUSLY BUBBLING A RELATIVELY SLOW COUNTERCURRENT OF DIFFUSED AIR UPWARDLY THROUGH SAID BED AND SAID WATER, SO THAT THE IMPURITIES
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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) | 1960-03-11 | 1960-09-10 | 1961-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-11 | 1964-09-10 | 1965-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-11 | 1968-09-10 | 1969-03-12 | $7700.00 | Window Closed / Lapsed |