US3775137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory diboride materials
Assignee: MAN LABS Inc
•
Filing: 1971-12-22
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Granted: 1973-11-27
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Expires: 1991-12-22
Abstract
Abstract New and improved diboride materials containing TiB2, ZrB2, HfB2, NbB2, TaB2 or mixtures thereof are produced by adding about 10 percent to 35 percent by volume of SiC, and preferably about 20 percent by volume SiC. Improved properties include, among others, lower fabrication temperature, grain size control, oxidation resistance, mechanical integrity, strength to density ratio, thermal stress resistance, and the like.
Inventors
- 👤 E Clougherty
- 👤 L Kaufman
- 👤 D Kalish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58078; C04B35/622; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
24 words
A formed diboride refractory article according to claim 1, wherein the silicon carbide is in an amount of about 20 per cent by volume.
References Cited (Backward Citations)
US2445296A
Cited
US2814566A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |