US2618565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silicon nitride-bonded articles
Assignee: Unifrax I LLC
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Filing: 1948-02-26
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Granted: 1952-11-18
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Expires: 1968-02-26
Abstract
No abstract record available.
Inventors
- 👤 Kenneth C Nicholson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:48
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/591
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
43 words
A RAW BATCH FOR THE MANUFACTURE OF BONDED SILICON CARBIDE ARTICLES HAVING A SILICON NITRIDE BOND IN WHICH THE SILICON NITRIDE HAS THE CHEMICAL FORMULA SI3N4, SAID RAW BATCH COMPRISING GRANULAR SILICON CARBIDE, FINELY DIVIDED SILICON AND 1/2% TO 5% OF A FLUORIDE.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |