Patent US3233741A successfully refreshed from Google Patents.
US3233741A
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Filter aid and method of purifying liquids using the same
Assignee: Johns Manville Corp
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Filing: 1961-06-20
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Granted: 1966-02-08
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Expires: 1981-06-20
Abstract
No abstract record available.
Inventors
- 👤 George R Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:43
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/103; B01J20/106; B01D; B01D37/00; B01D37/02; B01D37/03; B01J20/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A MIXTURE OF A FILTER AID CONSISTING OF FINELY DIVIDED, INERT SOLID PARTICLES, A FLOCCULATING INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SALTS OF TRIVALENT METALS SALTS OF TETRAVALENT METALS, AND MIXTURES THEREOF AND AN INORGANIC ALKALINE REAGENT IN AN AMOUNT TO PROVIDE A PH OF BETWEEN 4 AND 7 WHEN SAID COMPOSITION IS SUSPENDED IN WATER AT A FILTER AID CONCENTRATION OF AT LEAST 0.25% BY WEIGHT, SAID TRIVALENT METALLIC SALT AND SAID TETRAVALENT METALLIC SALT BEING CONVERTIBLE TO AN INSOLUBLE METALLIC HYDROXIDE WHEN IN SUSPENSION AND IN THE PRESENCE OF SAID ALKALINE REAGENT, AND PRESENT IN AN AMOUNT SO AS TO PROVIDE BETWEEN 0.5 AND 50% METALLIC HYDROXIDE CALCULATED ON THE WEIGHT OF THE FILTER AID.
Claim 2
Dependent Claim
126 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A MIXTURE OF A FILTER AID CONSISTING OF FINELY DIVIDED, INERT SOLID PARTICLES, A FLOCCULATING INORGANIC SALT SELECTED FROM THE GROUP CONSISTING OF SALTS OF TRIVALENT METALS SALTS OF TETRAVALENT METALS, AND MIXTURES THEREOF AND AN INORGANIC ALKALINE REAGENT IN AN AMOUNT TO PROVIDE A PH OF BETWEEN 4 AND 7 WHEN SAID COMPOSITION IS SUSPENDED IN WATER AT A FILTER AID CONCENTRATION OF AT LEAST 0.25% BY WEIGHT, SAID TRIVALENT METALLIC SALT AND SAID TETRAVALENT METALLIC SALT BEING CONVERTIBLE TO AN INSOLUBLE METALLIC HYDROXIDE WHEN IN SUSPENSION AND IN THE PRESENCE OF SAID ALKALINE REAGENT, AND PRESENT IN AN AMOUNT SO AS TO PROVIDE BETWEEN 0.5 AND 50% METALLIC HYDROXIDE CALCULATED ON THE WEIGHT OF THE FILTER AID.
References Cited (Backward Citations)
US2036258A
Cited
US2468188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-02-07 | 1969-08-09 | 1970-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-07 | 1973-08-09 | 1974-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-07 | 1977-08-09 | 1978-02-08 | $7700.00 | Window Closed / Lapsed |