Patent US2839413A successfully refreshed from Google Patents.
US2839413A
Expired / Lapsed
US
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Refractory body containing boron nitride
Assignee: Unifrax I LLC
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Filing: 1956-03-12
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Granted: 1958-06-17
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Expires: 1976-03-12
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/58085; C04B35/58092
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
24 words
A BONDED BORON NITRIDE BODY CONSISTING ESSENTIALLY OF 3% TO 92% BY WEIGHT BORON NITRIDE AND 97% TO 8% OF A SILCON NITRIDE BOND.
Claim 2
Dependent Claim
24 words
A BONDED BORON NITRIDE BODY CONSISTING ESSENTIALLY OF 3% TO 92% BY WEIGHT BORON NITRIDE AND 97% TO 8% OF A SILCON NITRIDE BOND.
References Cited (Backward Citations)
US1894685A
Cited
US2108794A
Cited
US2109246A
Cited
GB478016A
Cited
US2609318A
Cited
US2636826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |