US2579781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesia refractory and method of
Assignee: —
•
Filing: —
•
Granted: 1951-12-25
•
Expires: 1968-12-25
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:29
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/10; C01; C01F; C01F5/00; C01F5/02; C01F5/06; C01F5/08; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/70; C04B2235/72; C04B2235/74; C04B2235/77; C04B2235/96; C04B2235/9607
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
METHOD OF MAKING A DENSE, CRYSTALLINE, MAGNESIA PRODUCT WHICH COMPRISES ADMIXING FROM ABOUT 50% TO ABOUT 95% OF PERICLASE CONTAINING AT LEAST 95.0% MAGNESIUM OXIDE AND NOT OF A 2.0% SIO2 AND NOT OVER 2.0% CAO AND OF A PARTICLE SIZE SUBSTANTIALLY ENTIRELY PASSING 200 MESH AND WHICH HAS BEEN FIRED TO AN INACTIVE CONDITION, AND FROM ABOUT 5% TO ABOUT 50% OF ACTIVE MAGNESIA CONTAINING AT LEAST 95.0 MAGNESIUM OXIDE AND NOT OVER 2.0% SIO2 AND NOT OVER 2.0% CAO AND OF A PARTICLE SIZE SUBSTANTIALLY ALL PASSING 200 MESH, PRESSING, AND FIRING AT A TEMPERATURE OF AT LEAST 1650* C.
Claim 2
Dependent Claim
102 words
METHOD OF MAKING A DENSE, CRYSTALLINE, MAGNESIA PRODUCT WHICH COMPRISES ADMIXING FROM ABOUT 50% TO ABOUT 95% OF PERICLASE CONTAINING AT LEAST 95.0% MAGNESIUM OXIDE AND NOT OF A 2.0% SIO2 AND NOT OVER 2.0% CAO AND OF A PARTICLE SIZE SUBSTANTIALLY ENTIRELY PASSING 200 MESH AND WHICH HAS BEEN FIRED TO AN INACTIVE CONDITION, AND FROM ABOUT 5% TO ABOUT 50% OF ACTIVE MAGNESIA CONTAINING AT LEAST 95.0 MAGNESIUM OXIDE AND NOT OVER 2.0% SIO2 AND NOT OVER 2.0% CAO AND OF A PARTICLE SIZE SUBSTANTIALLY ALL PASSING 200 MESH, PRESSING, AND FIRING AT A TEMPERATURE OF AT LEAST 1650* C.
References Cited (Backward Citations)
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Cited
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GB211873A
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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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |