US3141737A
Expired / Lapsed
US
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Method for the preparation of aluminum nitride refractory material
Assignee: Saint Gobain Abrasives Inc
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Filing: 1962-06-04
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Granted: 1964-07-21
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Expires: 1982-06-04
Abstract
No abstract record available.
Inventors
- 👤 Howard J Bartlett
- 👤 David T Lapp
- 👤 Watson George Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:15
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/072; C01B21/0722
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A METHOD FOR THE PRODUCTION OF ALUMINUM NITRIDE WHICH COMPRISES FORMING A MIXTURE OF ALUMINUM METAL WITH A CYANAMIDE COMPOUND, SAID CYANAMIDE COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT TO SUPPLY AT LEAST ABOUT 1/10 MOLE OF NITROGEN FOR EACH MOLE OF ALUMINUM IN THE MIX, HEATING THE MIXTURE AT A TEMPERATURE ABOVE 1100*C. IN AN ATMOSPHERE OF NITROGEN, CONTINUING THE HEATING FOR A TIME EFFECTIVE TO CONVERT THE ALUMINUM TO ALUMINUM NITRIDE, AND COOLING THE PRODUCT IN A NITROGEN ATMOSPHERE.
Claim 2
Independent Claim
81 words
A METHOD FOR THE PRODUCTION OF ALUMINUM NITRIDE WHICH COMPRISES FORMING A MIXTURE OF ALUMINUM METAL WITH A CYANAMIDE COMPOUND, SAID CYANAMIDE COMPOUND BEING PRESENT IN AN AMOUNT SUFFICIENT TO SUPPLY AT LEAST ABOUT 1/10 MOLE OF NITROGEN FOR EACH MOLE OF ALUMINUM IN THE MIX, HEATING THE MIXTURE AT A TEMPERATURE ABOVE 1100*C. IN AN ATMOSPHERE OF NITROGEN, CONTINUING THE HEATING FOR A TIME EFFECTIVE TO CONVERT THE ALUMINUM TO ALUMINUM NITRIDE, AND COOLING THE PRODUCT IN A NITROGEN ATMOSPHERE.
References Cited (Backward Citations)
FR499486A
Cited
FR1258644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |