Patent US2801903A successfully refreshed from Google Patents.
US2801903A
Expired / Lapsed
US
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Process for the manufacture of boron nitride
Assignee: Saint Gobain Abrasives Inc
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Filing: 1953-09-16
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Granted: 1957-08-06
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Expires: 1973-09-16
Abstract
No abstract record available.
Inventors
- 👤 Guy H Fetterley
- 👤 George R Watson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01B21/0643
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
PROCESS FOR THE PRODUCTION OF BORON NITRIDE WHICH COMPRISES PASSING CHLORINE GAS THROUGH A MASS OF BORON CARBIDE HEATED TO ABOVE 300*C. OUT OF CONTACT WITH AIR AND OXYGEN, IMMEDIATELY THEREAFTER MIXING THE BORON TRICHLORIDE THUS PRODUCTED WITH AMMONIA AND IMMEDIATELY HEATING THE MICTURE TO BETWEEN 500*C. AND 1000*C. UNDER REDUCTING CONDITIONS ULTIMATELY RAISING THE TEMPERATURE OF THE MIXTURE OF BORON TRICHLORIDE AND AMMONIA TO BETWEEN 1600*C. AND 2200*C., THEN FILTERING THE PRODUCT OF THE REACTING TO REMOVE THE BORON NITRIDE THUS PRODUCED.
Claim 2
Dependent Claim
83 words
PROCESS FOR THE PRODUCTION OF BORON NITRIDE WHICH COMPRISES PASSING CHLORINE GAS THROUGH A MASS OF BORON CARBIDE HEATED TO ABOVE 300*C. OUT OF CONTACT WITH AIR AND OXYGEN, IMMEDIATELY THEREAFTER MIXING THE BORON TRICHLORIDE THUS PRODUCTED WITH AMMONIA AND IMMEDIATELY HEATING THE MICTURE TO BETWEEN 500*C. AND 1000*C. UNDER REDUCTING CONDITIONS ULTIMATELY RAISING THE TEMPERATURE OF THE MIXTURE OF BORON TRICHLORIDE AND AMMONIA TO BETWEEN 1600*C. AND 2200*C., THEN FILTERING THE PRODUCT OF THE REACTING TO REMOVE THE BORON NITRIDE THUS PRODUCED.
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) | 1960-08-05 | 1961-02-04 | 1961-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-05 | 1965-02-04 | 1965-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-05 | 1969-02-04 | 1969-08-06 | $7700.00 | Window Closed / Lapsed |