US3249449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass and slag resistant refractories and process of making same
Assignee: Societe Europeenne des Produits Refractaires SAS
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Filing: 1965-06-08
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Granted: 1966-05-03
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Expires: 1985-06-08
Abstract
No abstract record available.
Inventors
- 👤 Kiehl Jean-Pierre
- 👤 Nicolle Joel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A SINTERED REFRACTORY PRODUCT CONSISTING ESSENTIALLY OF ZIRCONIA, ALUMINA, A VITREOUS SILICA PHASE AND MULLITE, THE RATIO OF ZIRCONIA TO SILICA BEING NOT LESS THAN 2:1, SAID ZIRCONIA BEING SUBSTANTIALLY 19.0% TO 40% BY WEIGHT, SAID ALUMINA BEING SUBSTANTIALLY 12.0% TO 56.5% BY WEIGHT, SAID MULLITE BEING PRESENT IN AMOUNTS UP TO 20.0% BY WEIGHT, SAID VITREOUS SILICA PHASE BEING SUBSTANTIALLY 14.5% TO 28.5% BY WEIGHT, SAID PRODUCT HAVING SUBSTANTIALLY ZERO POROSITY, SUBSTANTIALLY ZERO PERMEABILITY, A HOMOGENEOUS STRUCTURE AND BEING SUBSTANTIALLY FREE FROM CAVITIES AND REDUCED ELEMENTS.
References Cited (Backward Citations)
US2842447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |