US2641532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of magnesium oxide
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1949-11-08
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Granted: 1953-06-09
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Expires: 1969-11-08
Abstract
No abstract record available.
Inventors
- 👤 James C Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:11
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
PROCESS FOR PREPARING CRYSTALLINE MAGNESIA WHICH COMPRISES UNIFORMLY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH UPON FIRING WILL FORM PERICLASE CONTAINING AT LEAST 95.0% MAGNESIUM OXIDE AND NOT OVER 2.0% SILICA AND AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF VANADIUM AND VANADIUM COMPOUNDS IN AN AMOUNT WHICH WILL PROVIDE UP TO ABOUT 5%
Claim 2
Dependent Claim
56 words
PROCESS FOR PREPARING CRYSTALLINE MAGNESIA WHICH COMPRISES UNIFORMLY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH UPON FIRING WILL FORM PERICLASE CONTAINING AT LEAST 95.0% MAGNESIUM OXIDE AND NOT OVER 2.0% SILICA AND AT LEAST ONE SUBSTANCE CHOSEN FROM THE GROUP CONSISTING OF VANADIUM AND VANADIUM COMPOUNDS IN AN AMOUNT WHICH WILL PROVIDE UP TO ABOUT 5%
References Cited (Backward Citations)
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 |