US2921859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous refractory material and method for manufacturing the same
Assignee: Compagnie de Saint Gobain SA
•
Filing: 1955-08-02
•
Granted: 1960-01-19
•
Expires: 1975-08-02
Abstract
No abstract record available.
Inventors
- 👤 Godron Yves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:20
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A REFACTORY MATERIAL HAVING A TOTAL POROSITY ABOVE 50%, COMPOSED ESSENTIALLY OF ZIRCONIA, SILICA AND ALUMINA, THE ZIRCONIA BEING PRESENT BETWEEN ABOUT 50 AND ABOUT 73% BY WEIGHT, THE ALUMINA BEING PRESENT BETWEEN ABOUT 8% AND ABOUT 20% BY WEIGHT, AND SILICA BEING PRESENT BETWEEN ABOUT 42% BY WEIGHT.
Claim 2
Dependent Claim
49 words
A REFACTORY MATERIAL HAVING A TOTAL POROSITY ABOVE 50%, COMPOSED ESSENTIALLY OF ZIRCONIA, SILICA AND ALUMINA, THE ZIRCONIA BEING PRESENT BETWEEN ABOUT 50 AND ABOUT 73% BY WEIGHT, THE ALUMINA BEING PRESENT BETWEEN ABOUT 8% AND ABOUT 20% BY WEIGHT, AND SILICA BEING PRESENT BETWEEN ABOUT 42% BY WEIGHT.
References Cited (Backward Citations)
DE733901C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |