US2903373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fused cast zirconia-alumina articles
Assignee: Unifrax I LLC
•
Filing: 1956-11-30
•
Granted: 1959-09-08
•
Expires: 1976-11-30
Abstract
No abstract record available.
Inventors
- 👤 Karl H Sandmeyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/484
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A FUSED CAST ARTICLE CONSISTING ESSENTIALLY OF CRYSTALLINE ALUMINA AND ZIRCONIA IN APPROXIMATELY 5:4 RATIO BY WEIGHT IN A SILICEOUS GLASSY MATRIX, SAID ARTICLES CONTAINING, BY OXIDE ANALYSIS, 1% TO 21/2% BY WEIGHT OF AN ALKALI OXIDE, 0.10% TO 0.5% BY WEIGHT OF BORIC OXIDE AND ABOUT 15% BY WEIGHT OF SILICA.
Claim 2
Dependent Claim
52 words
A FUSED CAST ARTICLE CONSISTING ESSENTIALLY OF CRYSTALLINE ALUMINA AND ZIRCONIA IN APPROXIMATELY 5:4 RATIO BY WEIGHT IN A SILICEOUS GLASSY MATRIX, SAID ARTICLES CONTAINING, BY OXIDE ANALYSIS, 1% TO 21/2% BY WEIGHT OF AN ALKALI OXIDE, 0.10% TO 0.5% BY WEIGHT OF BORIC OXIDE AND ABOUT 15% BY WEIGHT OF SILICA.
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) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |