Patent US3305374A successfully refreshed from Google Patents.
US3305374A
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US
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Ceramic compositions and process of making same
Assignee: Unifrax I LLC
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Filing: 1965-11-08
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Granted: 1967-02-21
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Expires: 1985-11-08
Abstract
No abstract record available.
Inventors
- 👤 Murata Yorihiro
- 👤 Leo R Sucharski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/58; C04B35/58007; C04B35/5805; C04B35/58064; C04B35/58078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A COMPOSITION OF MATTER MADE BY HOT PRESSING AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF FROM ABOUT 40 TO ABOUT 80 PERCENT OF TANTALUM MONONITRIDE AND FROM ABOUT 60 TO ABOUT 20 PERCENT ZIRCONIUM DIBORIDE AT A TEMPERATURE IN THE RANGE FROM ABOUT 1800*C. TO ABOUT 2200*C.
Claim 2
Dependent Claim
46 words
A COMPOSITION OF MATTER MADE BY HOT PRESSING AN INTIMATE MIXTURE CONSISTING ESSENTIALLY OF FROM ABOUT 40 TO ABOUT 80 PERCENT OF TANTALUM MONONITRIDE AND FROM ABOUT 60 TO ABOUT 20 PERCENT ZIRCONIUM DIBORIDE AT A TEMPERATURE IN THE RANGE FROM ABOUT 1800*C. TO ABOUT 2200*C.
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) | 1970-02-20 | 1970-08-22 | 1971-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-20 | 1974-08-22 | 1975-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-20 | 1978-08-22 | 1979-02-21 | $7700.00 | Window Closed / Lapsed |