US3194635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of aluminum refractory material
Assignee: Saint Gobain Abrasives Inc
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Filing: 1961-07-18
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Granted: 1965-07-13
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Expires: 1981-07-18
Abstract
No abstract record available.
Inventors
- 👤 David T Lapp
- 👤 Howard J Bartlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C01; C01B; C01B21/00; C01B21/06; C01B21/072; C01B21/0722
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD FOR THE PRODUCTION OF ALUMINUM NITRIDE REFRACTORY MATERIAL WHICH COMPRISES FORMING A MIXTURE OF FINELY DIVIDED ALUMINUM WITH FINELY DIVIDED CARBON IN AN AMOUNT OF ABOUT 5% TO 20% BY WEIGHT OF THE MIXTURE, HEATING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 1000* AND 1500*C. IN AN ATMOSPHERE OF EXCESS NITROGEN, CONTINUING SAID HEATING FOR A TIME-EFFECTIVE TO CONVERT THE ALUMINUM TO ALUMINUM NITRIDE, AND COOLING THE MIXTURE IN THE NITROGEN ATMOSPHERE.
Claim 2
Independent Claim
74 words
A METHOD FOR THE PRODUCTION OF ALUMINUM NITRIDE REFRACTORY MATERIAL WHICH COMPRISES FORMING A MIXTURE OF FINELY DIVIDED ALUMINUM WITH FINELY DIVIDED CARBON IN AN AMOUNT OF ABOUT 5% TO 20% BY WEIGHT OF THE MIXTURE, HEATING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 1000* AND 1500*C. IN AN ATMOSPHERE OF EXCESS NITROGEN, CONTINUING SAID HEATING FOR A TIME-EFFECTIVE TO CONVERT THE ALUMINUM TO ALUMINUM NITRIDE, AND COOLING THE MIXTURE IN THE NITROGEN ATMOSPHERE.
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) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |