Patent US2997402A successfully refreshed from Google Patents.
US2997402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory brick and preparation thereof
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1958-04-23
•
Granted: 1961-08-22
•
Expires: 1978-04-23
Abstract
No abstract record available.
Inventors
- 👤 Howard A Mcdonald
- 👤 James E Dore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:02
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B33/32; C04B33/323; C04B35/00; C04B35/01; C04B35/10; C04B35/66; C22; C22B; C22B21/00; C22B21/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A NONFUSED REFRACTORY PRODUCT, CHARACTERIZED BY HIGH RESISTANCE TO ATTACK AND PENETRATION BY MOLTEN ALU MINUM METAL, CONSISTING ESSENTIALLY OF A REFRACTORY AG GREGATE MATERIAL AND IN INTIMATE ADMIXTURE THEREWITH FROM 5% TO 15% OF A PERFORMED VITEOUS, HOMOGENEOUS GLASSY PRODUCT CONSISTING ESSENTIALLY OF FROM 15% TO 80% BORON OXIDE, FROM 4% TO 50% CALCIUM OXIDE, FROM 2% TO 60% ALUMINUM OXIDE, THE REMAINDER BEING NOT OVER 15% OF AN OXIDE OF AT LEAST ONE OTHER METAL CHOSEN FROM THE GROUP CONSISTING OF MAGNESIUM, BARIUM, BERYLLIUM, ZIRCONIUM, ZINC, VANADIUM, CHROMIUM AND MOLYBDENUM, SAID VITREOUS PRODUCT CONTAINING NOY MORE THAN 10% SIO2.
Claim 2
Dependent Claim
101 words
A NONFUSED REFRACTORY PRODUCT, CHARACTERIZED BY HIGH RESISTANCE TO ATTACK AND PENETRATION BY MOLTEN ALU MINUM METAL, CONSISTING ESSENTIALLY OF A REFRACTORY AG GREGATE MATERIAL AND IN INTIMATE ADMIXTURE THEREWITH FROM 5% TO 15% OF A PERFORMED VITEOUS, HOMOGENEOUS GLASSY PRODUCT CONSISTING ESSENTIALLY OF FROM 15% TO 80% BORON OXIDE, FROM 4% TO 50% CALCIUM OXIDE, FROM 2% TO 60% ALUMINUM OXIDE, THE REMAINDER BEING NOT OVER 15% OF AN OXIDE OF AT LEAST ONE OTHER METAL CHOSEN FROM THE GROUP CONSISTING OF MAGNESIUM, BARIUM, BERYLLIUM, ZIRCONIUM, ZINC, VANADIUM, CHROMIUM AND MOLYBDENUM, SAID VITREOUS PRODUCT CONTAINING NOY MORE THAN 10% SIO2.
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) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |