US3564086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a thermal shock resistant beryllium oxide composite
Assignee: NGK Insulators Ltd
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Filing: 1967-05-18
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Granted: 1971-02-16
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Expires: 1987-05-18
Abstract
Abstract A METHOD OF MAKING A BERYLLIUM OXIDE COMPOSITE HAVING A MULTI-PHASE STRUCTURE OF AN OXIDE POLYCRYSTALLINE PHASE AND A NON-OXIDE CRYSTAL PHASE WITH A GAP OR CRACKS BEING FORMED BETWEEN THE TWO PHASES AND BETWEEN EACH OXIDE POLYCRYSTALLINE PHASE. THIS IS ACCOMPLISHED BY SHAPING A MIXTURE OF 0.5-15% BY WEIGHT OF AT LEAST ONE HIGH MELTING CARBIDE, BORIDE, OR SILICIDE SELECTED FROM THE GROUP CONSISTING OF TITANIUM, ZIROMIUM, NIOBIUM, TANTALUM, CHROMIUM, MOLYBDENUM, TUNGSTEN AND VANADIUM, AND SILICON CARBIDE THE REMAINDER BEING BERYLLIUM OXIDE, AND FIRING THE SHAPED MIXTURE TO 1700*C.
Inventors
- 👤 Susumu Nishigaki
- 👤 Kazuo Kobayashi
- 👤 Hiroshige Mizuno
- 👤 Takehiro Kajihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |