US3344080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory oxides doped with silicon carbide and silicon nitride
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1965-06-21
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Granted: 1967-09-26
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Expires: 1985-06-21
Abstract
No abstract record available.
Inventors
- 👤 Livey David Thomas
- 👤 O'neill John Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/01; C04B35/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF RESTRICTING GRAIN GROWTH IN SINTERED BODIED COMPRISING THE STEPS OF: (A) MIXING A FINE POWDER OF A REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF BERYLIA, ALUMINA, MAGNESIA, ZINCONIA, URANIUM DIOXIDE AND THORIA WITH LESS THAN 10% BY WEIGHT OF A SUB-MICRON SIZE GRAIN GROWTH RESTRICTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON CARBIDE AND SILICON NITRIDE; (B) SHAPING SUCH MIXTURE TO FORM A SHAPED BODY; AND (C) HEATING SAID SHAPED BODY TO PRODUCE A SINTERED BODY HAVING A MAXIMUM GRAIN SIZE OF ABOUT 10 MICRONS.
Claim 2
Independent Claim
90 words
A METHOD OF RESTRICTING GRAIN GROWTH IN SINTERED BODIED COMPRISING THE STEPS OF: (A) MIXING A FINE POWDER OF A REFRACTORY OXIDE SELECTED FROM THE GROUP CONSISTING OF BERYLIA, ALUMINA, MAGNESIA, ZINCONIA, URANIUM DIOXIDE AND THORIA WITH LESS THAN 10% BY WEIGHT OF A SUB-MICRON SIZE GRAIN GROWTH RESTRICTING MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON CARBIDE AND SILICON NITRIDE; (B) SHAPING SUCH MIXTURE TO FORM A SHAPED BODY; AND (C) HEATING SAID SHAPED BODY TO PRODUCE A SINTERED BODY HAVING A MAXIMUM GRAIN SIZE OF ABOUT 10 MICRONS.
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) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |