Patent US1685059A successfully refreshed from Google Patents.
Patent US2812241A successfully refreshed from Google Patents.
US2812241A
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Process for forming crystalline magnesia of high purity and of high density
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1953-11-16
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Granted: 1957-11-05
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Expires: 1973-11-16
Abstract
No abstract record available.
Inventors
- 👤 Wallace O Austin
- 👤 Clarence A Rick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:59
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/06; C01F5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PROCESS FOR PREPARING DENSE PERICLASE REFRACTORY MATERIAL WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH FORMS PERICLASE UPON FIRING, CONTAINING AT LEAST 95.0% MGO, NOT OVER 2% SIO2 AND NOT OVER 2% CAO ON AN IGNITED BASIS, A BORON MATERIAL AS A CRYSTALIZATION PROMOTER, SAID BORON MATERIAL BEING ADDED IN AN AMOUNT TO PROVIDE 0.25% TO 5.0% BY WEIGHT BORON AS ADDED CALCULATED AS B2O3 ON THE FIRED BASIS, A CHROMIUM MATERIAL IN AN AMOUNT TO PROVIDE FROM 0.10* TO 2.0% BY WEIGHT THEREOF AS ADDED, CALCULATED AS CR2O3 OF THE FIRED BASIS AND FIRING SAID ADMIXING WITHOUT FUSION TO FORM WELL CRYSTALLIZED PERICLASE.
Claim 2
Dependent Claim
107 words
A PROCESS FOR PREPARING DENSE PERICLASE REFRACTORY MATERIAL WHICH COMPRISES INTIMATELY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH FORMS PERICLASE UPON FIRING, CONTAINING AT LEAST 95.0% MGO, NOT OVER 2% SIO2 AND NOT OVER 2% CAO ON AN IGNITED BASIS, A BORON MATERIAL AS A CRYSTALIZATION PROMOTER, SAID BORON MATERIAL BEING ADDED IN AN AMOUNT TO PROVIDE 0.25% TO 5.0% BY WEIGHT BORON AS ADDED CALCULATED AS B2O3 ON THE FIRED BASIS, A CHROMIUM MATERIAL IN AN AMOUNT TO PROVIDE FROM 0.10* TO 2.0% BY WEIGHT THEREOF AS ADDED, CALCULATED AS CR2O3 OF THE FIRED BASIS AND FIRING SAID ADMIXING WITHOUT FUSION TO FORM WELL CRYSTALLIZED PERICLASE.
References Cited (Backward Citations)
US2571101A
Cited
US2178983A
Cited
US2405055A
Cited
US2398743A
Cited
US2487290A
Cited
US2571983A
Cited
US2641531A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |