Patent US2571983A successfully refreshed from Google Patents.
US2571983A
Expired / Lapsed
US
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Process of purifying magnesia containing impurities including iron, manganese, and boron
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1948-04-19
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Granted: 1951-10-16
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Expires: 1968-04-19
Abstract
No abstract record available.
Inventors
- 👤 Woodward Teynham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:51
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
PROCESS OF PURIFYING MAGNESIA CONTAINING IMPURITIES INCLUDING IRON, MANGANESE AND BORON WHICH COMPRISES TREATING SAID MAGNESIA WITH A STREAM OF CHLORINE GAS IN AN AMOUNT SUFFICIENT TO CONVERT SAID IMPURITIES TO CHLORIDES BUT LESS THAN THE AMOUNT REQUIRED TO CONVERT A SUBSTANTIAL PORTION OF THE MAGNESIA TO MAGNESIUM CHLORIDE IN THE PRESENCE OF A SLIGHTLY REDUCING GAS MIXTURE, AT A TEMPERATURE OF FROM ABOUT 800* C. TO ABOUT 1500* C., SAID GAS MIXTURE CONTAINING AT LEAST A MAJOR PROPORTION OF INERT GAS AND NOT MORE THAN A MINOR PROPORTION OF A REDUCING GAS, THEREBY VOLATILLIZING THE MAJOR PROPORTION OF SAID IMPURITIES AS CHLORIDES WITHOUT SUBSTANTIAL REACTION OF THE MGO, AND RECOVERING THE TREATED MAGNESIA.
Claim 2
Dependent Claim
114 words
PROCESS OF PURIFYING MAGNESIA CONTAINING IMPURITIES INCLUDING IRON, MANGANESE AND BORON WHICH COMPRISES TREATING SAID MAGNESIA WITH A STREAM OF CHLORINE GAS IN AN AMOUNT SUFFICIENT TO CONVERT SAID IMPURITIES TO CHLORIDES BUT LESS THAN THE AMOUNT REQUIRED TO CONVERT A SUBSTANTIAL PORTION OF THE MAGNESIA TO MAGNESIUM CHLORIDE IN THE PRESENCE OF A SLIGHTLY REDUCING GAS MIXTURE, AT A TEMPERATURE OF FROM ABOUT 800* C. TO ABOUT 1500* C., SAID GAS MIXTURE CONTAINING AT LEAST A MAJOR PROPORTION OF INERT GAS AND NOT MORE THAN A MINOR PROPORTION OF A REDUCING GAS, THEREBY VOLATILLIZING THE MAJOR PROPORTION OF SAID IMPURITIES AS CHLORIDES WITHOUT SUBSTANTIAL REACTION OF THE MGO, AND RECOVERING THE TREATED MAGNESIA.
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) | 1954-10-15 | 1955-04-16 | 1955-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-15 | 1959-04-16 | 1959-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-15 | 1963-04-16 | 1963-10-16 | $7700.00 | Window Closed / Lapsed |