US2804373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for purifying magnesium oxide
Assignee: International Minerals and Chemical Corp
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Filing: 1955-05-05
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Granted: 1957-08-27
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Expires: 1975-05-05
Abstract
No abstract record available.
Inventors
- 👤 William B Dancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:58
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A PROCESS WHICH COMPRISES ADMIXING CRUDE MAGNESIUM OXIDE WITH A CARBONACEOUS METERIAL, PELLETIZING SAID ADMIXTURE, HEATING SAID PELLETS AT A TEMPERATURE OF AT LEAST 2400*F. UNTIL THE IMPURITIES ARE SUBSTANTIALLY COMPLETELY VOLATILIZED AND REMOVING THE VOLATILIZED IMPURITIES FROM THE REACTION MIXTURE, SAID CRUDE MAGNESIUM OXIDE CONTAINING AS IMPURITIES AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFATE AND CHLORIDES OF ALKALI METALS AND MAGNESIUM IN CONCENTRATIONS OF AT LEAST ABOUT 4% BY WEIGHT OF SULFATE COMPOUNDS AND AT LEAST ABOUT 0.5% BY WEIGHT OF CHLORIDE COMPOUNDS.
Claim 2
Dependent Claim
88 words
A PROCESS WHICH COMPRISES ADMIXING CRUDE MAGNESIUM OXIDE WITH A CARBONACEOUS METERIAL, PELLETIZING SAID ADMIXTURE, HEATING SAID PELLETS AT A TEMPERATURE OF AT LEAST 2400*F. UNTIL THE IMPURITIES ARE SUBSTANTIALLY COMPLETELY VOLATILIZED AND REMOVING THE VOLATILIZED IMPURITIES FROM THE REACTION MIXTURE, SAID CRUDE MAGNESIUM OXIDE CONTAINING AS IMPURITIES AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SULFATE AND CHLORIDES OF ALKALI METALS AND MAGNESIUM IN CONCENTRATIONS OF AT LEAST ABOUT 4% BY WEIGHT OF SULFATE COMPOUNDS AND AT LEAST ABOUT 0.5% BY WEIGHT OF CHLORIDE COMPOUNDS.
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) | 1960-08-26 | 1961-02-25 | 1961-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-26 | 1965-02-25 | 1965-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-26 | 1969-02-25 | 1969-08-27 | $7700.00 | Window Closed / Lapsed |