US2671732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesite-chrome refractories
Assignee: Harbison Walker Refractories Co
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Filing: 1950-02-11
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Granted: 1954-03-09
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Expires: 1970-02-11
Abstract
No abstract record available.
Inventors
- 👤 Raymond E Birch
- 👤 Clyde L Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
BASIC UNFUSES REFRACTORY BRICK IN WHICH DEAD BURNED MAGNESITE IS THE PREPONDERANT ELEMENT A PART OF SAID MAGNESITE BEING LESS THAN 65-MESH, AND CONTAINING, BY WEIGHT, AT LEAST ABOUT 20 TO ABOUT 40 PER CENT OF CHROME ORE, AND AT LEAST 10 TO ABOUT 35 PER CENT OF CALCINED ADDED ALUMINA OF WHICH AT LEAST PART IS LESS THEN 150MESH, AND IN THE BURNED CONDITION HAVING A MODULUS OF RUPTURE GREATER THAN 600 POUNDS PER SQUARE INCH AS MEASURED BY THE STANDARD A.S.T. M. TEST, AND MAINTAINING ITS STRENGTH AFTER REPEATED REVERSALS OF ATMOSPHERE.
Claim 2
Dependent Claim
94 words
BASIC UNFUSES REFRACTORY BRICK IN WHICH DEAD BURNED MAGNESITE IS THE PREPONDERANT ELEMENT A PART OF SAID MAGNESITE BEING LESS THAN 65-MESH, AND CONTAINING, BY WEIGHT, AT LEAST ABOUT 20 TO ABOUT 40 PER CENT OF CHROME ORE, AND AT LEAST 10 TO ABOUT 35 PER CENT OF CALCINED ADDED ALUMINA OF WHICH AT LEAST PART IS LESS THEN 150MESH, AND IN THE BURNED CONDITION HAVING A MODULUS OF RUPTURE GREATER THAN 600 POUNDS PER SQUARE INCH AS MEASURED BY THE STANDARD A.S.T. M. TEST, AND MAINTAINING ITS STRENGTH AFTER REPEATED REVERSALS OF ATMOSPHERE.
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) | 1957-03-08 | 1957-09-07 | 1958-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-08 | 1961-09-07 | 1962-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-08 | 1965-09-07 | 1966-03-09 | $7700.00 | Window Closed / Lapsed |