US3312557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Basic refractory product
Assignee: Harbison Walker Refractories Co
•
Filing: 1964-10-28
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Granted: 1967-04-04
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Expires: 1984-10-28
Abstract
No abstract record available.
Inventors
- 👤 Peter H Havranek
- 👤 Davies Ben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31815
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A TAR-IMPREGNATED, BURNED, BASIC REFRACTORY BRICK MADE FROM A GRAIN CONSISTING ESSENTIALLY OF AT LEAST 88 TO LESS THAN 96% MGO, FROM 1 TO 3%, BY WEIGHT, OF AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZINC, TIN, COPPER, NICKEL, VANADIUM, MANGANESE, CADMIUM, ZIRCONIUM AND IRON, WHICH SELECTED OXIDE IS REDUCIBLE AND DOES NOT REACT WITH OTHER COMPONENTS OF THE BRICK TO FORM MELTS BELOW ABOUT 2700*F., THERE BEING CAO AND SIO2 IN A WEIGHT RATIO IN WHICH THERE IS AT LEAST 2 PARTS LIME FOR EACH 1 PART OF SILICA, BY WEIGHT, THERE BEING NO MORE THAN 1% OF OTHER IMPURITIES INCLUDING AL2O3, ON AN OXIDE BASIS, THE TAR-IMPREGNATION BEING THROUGHOUT ALL INTERNAL VOID STRUCTURE AND ABOUT EXTERIOR SURFACES OF THE BRICK.
Claim 2
Dependent Claim
127 words
A TAR-IMPREGNATED, BURNED, BASIC REFRACTORY BRICK MADE FROM A GRAIN CONSISTING ESSENTIALLY OF AT LEAST 88 TO LESS THAN 96% MGO, FROM 1 TO 3%, BY WEIGHT, OF AN OXIDE OF A METAL SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZINC, TIN, COPPER, NICKEL, VANADIUM, MANGANESE, CADMIUM, ZIRCONIUM AND IRON, WHICH SELECTED OXIDE IS REDUCIBLE AND DOES NOT REACT WITH OTHER COMPONENTS OF THE BRICK TO FORM MELTS BELOW ABOUT 2700*F., THERE BEING CAO AND SIO2 IN A WEIGHT RATIO IN WHICH THERE IS AT LEAST 2 PARTS LIME FOR EACH 1 PART OF SILICA, BY WEIGHT, THERE BEING NO MORE THAN 1% OF OTHER IMPURITIES INCLUDING AL2O3, ON AN OXIDE BASIS, THE TAR-IMPREGNATION BEING THROUGHOUT ALL INTERNAL VOID STRUCTURE AND ABOUT EXTERIOR SURFACES OF THE BRICK.
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) | 1970-04-03 | 1970-10-03 | 1971-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-04-03 | 1974-10-03 | 1975-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-04-03 | 1978-10-03 | 1979-04-04 | $7700.00 | Window Closed / Lapsed |