US3132953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cast refractory and method of making
Assignee: Cohart Refractories Co
•
Filing: 1961-07-26
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Granted: 1964-05-12
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Expires: 1981-07-26
Abstract
No abstract record available.
Inventors
- 👤 Allen M Alper
- 👤 Edward R Begley
- 👤 Joseph W Londeree
- 👤 Robert N Mcnally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/484
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
65 words
A FUSED CAST REFRACTORY CONSISTING ESSENTIALLY OF CRYSTALLINE ZIRCONIA AND CORUNDUM IN A SILICEOUS GLASS MATRIX AND CONTAINING 15% TO 60% ZRO2, 1% TO 20% SIO2, 0.05% TO 1.5% OF A HALOGEN, 0.5% TO 2.5% ALKALI OXIDE, UP TO ABOUT 0.5% EACH OF FE2O2 AND TIO2, UP TO ABOUT 0.8% MGO, UP TO ABOUT 1.5% EACH OF CAO AND B2O3, AND THE BALANCE ESSENTIALLY AL2O3.
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) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |