US2542743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying and clarifying water
Assignee: JOHNS MANVIILE CORP
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Filing: 1947-01-25
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Granted: 1951-02-20
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Expires: 1967-01-25
Abstract
No abstract record available.
Inventors
- 👤 Laurence E Weymouth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:40
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01D; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
IN CLARIFYING WATER CONTAINING SOLID IMPURITIES THE STEPS COMPRISING, REGENERATING A COARSE GRADE OF DIATOMACEOUS FILTER AID CONTAINING FLOCCULENT ALUMINUM HYDRATE AS A CONTAMINANT BY HEATING AT A TEMPERATURE OF 220-600* F. FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY DEHYDRATE THE ALUMINUM HYDRATE, FORMING IN THE WATER A FLOCCULENT PRECIPITATE OF ALUMINUM HYDRATE, SEPARATING A MAJOR PORTION OF THE PRECIPITATE FROM THE PARTIALLY CLARIFIED WATER BY QUIESCENT SETTLING, ADMIXING SAID REGENERATED DIATOMACEOUS FILTER AID WITH THE PARTIALLY CLARIFIED WATER CONTAINING RESIDUAL FLOCK IN SUSPENSION, AND FILTERING THE RESULTING SLURRY THROUGH A BED OF SAID FILTER AID.
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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) | 1954-02-19 | 1954-08-21 | 1955-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-19 | 1958-08-21 | 1959-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-19 | 1962-08-21 | 1963-02-20 | $7700.00 | Window Closed / Lapsed |