US2636826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon carbide refractory
Assignee: Unifrax I LLC
•
Filing: 1950-06-02
•
Granted: 1953-04-28
•
Expires: 1970-06-02
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6316; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; Y; Y10; Y10S; Y10S264/00; Y10S264/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
A BONDED SILICON CARBIDE ARTICLE COMPRISING SILICON CARBIDE GRAINS AND A SILICON NITRIDE BOND, SAID BOND CONTAINING ZIRCONIUM OXIDE.
Claim 2
Dependent Claim
19 words
A BONDED SILICON CARBIDE ARTICLE COMPRISING SILICON CARBIDE GRAINS AND A SILICON NITRIDE BOND, SAID BOND CONTAINING ZIRCONIUM OXIDE.
References Cited (Backward Citations)
US2364108A
Cited
US2406275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |