US2701240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diatomaceous earth product and method for its manufacture
Assignee: GREAT LAKES CARBON CORP
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Filing: 1951-06-07
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Granted: 1955-02-01
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Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 George W Bregar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD FOR PREPARING A DIATOMACEOUS EARTH FILTERAID OF LOW SOLUBILITY IN WATER OR ACIDS WHICH COMPRISES CALCINING AT A TEMPERATURE ABOVE ABOUT 1000* F., A MIXTURE OF DIATOMACEOUS EARTH CONTAINING SUBSTANTIAL AMOUNTS OF IRON AND ALUMINUM IMPURITIES WITH AT LEAST ONE AGENT OF THE GROUP CONSISTING OF THE OXY ACIDS OF PHOSPHORUS AND THEIR ANHYDRIDES, AMMONIUM SALTS AND ALKALI METAL SALTS, SAID AGENT BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 1 AND ABOUT 4 PARTS BY WEIGHT OF THE IRON AND ALUMINUM IMPURITIES ORIGINALLY PRESENT IN SAID EARTH, AND ACID WASHING THE RESULTING PRODUCT TO REMOVE ACID-SOLUBLE VALUES THEREFROM.
Claim 2
Independent Claim
100 words
A METHOD FOR PREPARING A DIATOMACEOUS EARTH FILTERAID OF LOW SOLUBILITY IN WATER OR ACIDS WHICH COMPRISES CALCINING AT A TEMPERATURE ABOVE ABOUT 1000* F., A MIXTURE OF DIATOMACEOUS EARTH CONTAINING SUBSTANTIAL AMOUNTS OF IRON AND ALUMINUM IMPURITIES WITH AT LEAST ONE AGENT OF THE GROUP CONSISTING OF THE OXY ACIDS OF PHOSPHORUS AND THEIR ANHYDRIDES, AMMONIUM SALTS AND ALKALI METAL SALTS, SAID AGENT BEING PRESENT IN AN AMOUNT BETWEEN ABOUT 1 AND ABOUT 4 PARTS BY WEIGHT OF THE IRON AND ALUMINUM IMPURITIES ORIGINALLY PRESENT IN SAID EARTH, AND ACID WASHING THE RESULTING PRODUCT TO REMOVE ACID-SOLUBLE VALUES THEREFROM.
References Cited (Backward Citations)
US1502547A
Cited
US1992547A
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US2120702A
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US2283174A
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US2381481A
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US2466049A
Cited
US2575457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |