US3049447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating an alumina ceramic article with lithium borate
Assignee: General Dynamics Corp
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Filing: 1959-06-30
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Granted: 1962-08-14
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Expires: 1979-06-30
Abstract
No abstract record available.
Inventors
- 👤 Knapp William John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:46
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5006; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF FABRICATING AN IMPROVED HIGH TEMPERATURE LITHIUM BORATE-CONTAINING CERAMIC PORDUCT, WHICH METHOD COMPRISES DEPOSITING LITHIUM BORATE ON THE SURFACE OF AN ALUMINA CERAMIC ARTICLE,MELTING SAID BORATE AT A TEMPERATURE AT LEAST ABOUT 800*C. BUT BELOW 930*C., THAT IS, BELOW THE MELTING POINT OF A FUSED MIXTURE OF ALUMINA AND LITHIUM BORATE, WHEREBY SAID BORATE PENETRATES AND FILLS PORES OF SAID ALUMINA ARTICLE SO AS TO MAKE SAID ALUMINA SUBSTANTIALLY IMPERMEABLE WITHOUT DIMENSIONAL DISTORITON OF SAID ARTICLE, AND THEREUPON COOLING SAID ARTICLE TO AMBIENT TEMPERATURE TO PROVIDE A FINISHED SUBSTANTIALLY IMPERMEABLE ALUMINA ARTICLE HAVING ESSENTIALLY THE SAME SHAPE BEFORE SAID LITHIUM BORATE DEPOSITION.
Claim 2
Independent Claim
104 words
A METHOD OF FABRICATING AN IMPROVED HIGH TEMPERATURE LITHIUM BORATE-CONTAINING CERAMIC PORDUCT, WHICH METHOD COMPRISES DEPOSITING LITHIUM BORATE ON THE SURFACE OF AN ALUMINA CERAMIC ARTICLE,MELTING SAID BORATE AT A TEMPERATURE AT LEAST ABOUT 800*C. BUT BELOW 930*C., THAT IS, BELOW THE MELTING POINT OF A FUSED MIXTURE OF ALUMINA AND LITHIUM BORATE, WHEREBY SAID BORATE PENETRATES AND FILLS PORES OF SAID ALUMINA ARTICLE SO AS TO MAKE SAID ALUMINA SUBSTANTIALLY IMPERMEABLE WITHOUT DIMENSIONAL DISTORITON OF SAID ARTICLE, AND THEREUPON COOLING SAID ARTICLE TO AMBIENT TEMPERATURE TO PROVIDE A FINISHED SUBSTANTIALLY IMPERMEABLE ALUMINA ARTICLE HAVING ESSENTIALLY THE SAME SHAPE BEFORE SAID LITHIUM BORATE DEPOSITION.
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) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |