Patent US4374364A successfully refreshed from Google Patents.
Patent US2641529A successfully refreshed from Google Patents.
US2641529A
Expired / Lapsed
US
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Production of magnesia
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1950-05-17
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Granted: 1953-06-09
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Expires: 1970-05-17
Abstract
No abstract record available.
Inventors
- 👤 Leslie W Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:54
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
PROCESS FOR PREPARING CRYSTALLINE MAGNESIA WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH YIELDS PERICLASE UPON FIRING CONTAINING AT LEAST 95% MGO AND LESS THAN 2.0% CAO AND LESS THAN 2.0% SIO2 AND AN ALUMINUM COMPOUND, SAID ALUMINUM COMPOUND BEING ADDED IN AN AMOUNT TO PROVIDE UP TO 1.5% ALUMINUM AS ADDED CALCULATED AS AL2O3, BASED ON THE TOTAL WEIGHT OF THE FIRED PRODUCT, AND FIRING SAID MIXTURE TO FORM HIGH PURITY PERICLASE.
Claim 2
Dependent Claim
75 words
PROCESS FOR PREPARING CRYSTALLINE MAGNESIA WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH YIELDS PERICLASE UPON FIRING CONTAINING AT LEAST 95% MGO AND LESS THAN 2.0% CAO AND LESS THAN 2.0% SIO2 AND AN ALUMINUM COMPOUND, SAID ALUMINUM COMPOUND BEING ADDED IN AN AMOUNT TO PROVIDE UP TO 1.5% ALUMINUM AS ADDED CALCULATED AS AL2O3, BASED ON THE TOTAL WEIGHT OF THE FIRED PRODUCT, AND FIRING SAID MIXTURE TO FORM HIGH PURITY PERICLASE.
References Cited (Backward Citations)
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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) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |