Patent US2636825A successfully refreshed from Google Patents.
US2636825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory carbide and nitride product and method of making
Assignee: Unifrax I LLC
•
Filing: 1948-12-30
•
Granted: 1953-04-28
•
Expires: 1968-12-30
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; B; B24; B24C; B24C11/00; B24D; B24D3/00; B24D3/02; B24D3/04; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/991; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/56; C04B35/565; C04B2235/00; C04B2235/70; C04B2235/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
AS A NEW ARTICLE OF MANUFACTURE, A BODY COMPRISING GRANULAR SILICON BONDED BY A MATRIX OF BORON CARBIDE AND BORON NITRIDE.
Claim 2
Dependent Claim
21 words
AS A NEW ARTICLE OF MANUFACTURE, A BODY COMPRISING GRANULAR SILICON BONDED BY A MATRIX OF BORON CARBIDE AND BORON NITRIDE.
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 |