US2641530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of magnesia
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1949-06-27
•
Granted: 1953-06-09
•
Expires: 1969-06-27
Abstract
No abstract record available.
Inventors
- 👤 Leslie W Austin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:49
CPC Classifications
C; C01; C01F; C01F5/00; C01F5/02; C01F5/06; C01P; C01P2006/00; C01P2006/80
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 WILL YIELD PERICLASE UPON FIRING AND CONTAINING AT LEAST 95% MGO, NOT OVER 2% CAO, AND NOT OVER 2% SIO2 ON THE FIRED BASIS, A WATER SOLUTION OF AN IRON COMPOUND AND A CHROMIUM-CONTAINING MATERIAL, SAID IRON COMPOUND AND SAID CHROMIUM-CONTAINING
Claim 2
Dependent Claim
56 words
PROCESS FOR PREPARING CRYSTALLINE MAGNESIA WHICH COMPRISES UNIFORMLY ADMIXING A FINELY DIVIDED MAGNESIUM COMPOUND WHICH WILL YIELD PERICLASE UPON FIRING AND CONTAINING AT LEAST 95% MGO, NOT OVER 2% CAO, AND NOT OVER 2% SIO2 ON THE FIRED BASIS, A WATER SOLUTION OF AN IRON COMPOUND AND A CHROMIUM-CONTAINING MATERIAL, SAID IRON COMPOUND AND SAID CHROMIUM-CONTAINING
References Cited (Backward Citations)
US1527347A
Cited
US2281477A
Cited
US2447412A
Cited
US1880315A
Cited
GB546642A
Cited
GB583009A
Cited
US2487290A
Cited
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 |