US3227568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory brick
Assignee: Harbison Walker Refractories Co
•
Filing: 1964-02-06
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Granted: 1966-01-04
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Expires: 1984-02-06
Abstract
No abstract record available.
Inventors
- 👤 Donald F Stock
- 👤 Berhl E Wishon
- 👤 Pierce J Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A REFRACTORY BATCH FOR MAKING IMPROVED CERAMICALLY BONDED SEMI-SILICA BRICK CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM 70 TO 90% OF SILICEOUS CLAY FROM 5 TO 20% OF BOND CLAY AND FROM ABOUT 5 TO 20% OF A KAOLINIC CLAY, SAID SILICEOUS CLAY BEING CHARACTERIZED BY HAVING A THERMAL COEFFICIENT OF EXPANSION OF AT LEAST ABOUT 5X10**6/*F. AND SAID KALOLINITIC CLAY BEING CHARACTERIZED BY HAVING A THERMAL COEFFICIENT OF EXPANSION OF LESS THAN ABOUT 2.5X10**-6/*F.
Claim 2
Dependent Claim
74 words
A REFRACTORY BATCH FOR MAKING IMPROVED CERAMICALLY BONDED SEMI-SILICA BRICK CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM 70 TO 90% OF SILICEOUS CLAY FROM 5 TO 20% OF BOND CLAY AND FROM ABOUT 5 TO 20% OF A KAOLINIC CLAY, SAID SILICEOUS CLAY BEING CHARACTERIZED BY HAVING A THERMAL COEFFICIENT OF EXPANSION OF AT LEAST ABOUT 5X10**6/*F. AND SAID KALOLINITIC CLAY BEING CHARACTERIZED BY HAVING A THERMAL COEFFICIENT OF EXPANSION OF LESS THAN ABOUT 2.5X10**-6/*F.
References Cited (Backward Citations)
US2990289A
Cited
US3026212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |