US3241918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing boron nitride
Assignee: Union Carbide Corp
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Filing: 1962-05-09
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Granted: 1966-03-22
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Jr William S Lenihan
- 👤 Ronald W Reidl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C01; C01B; C01B21/00; C01B21/06; C01B21/064; C01P; C01P2004/00; C01P2004/01; C01P2004/03; C01P2006/00; C01P2006/10; C01P2006/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
A PROCESS FOR PREPARING A HOT PRESSED BORON NITRIDE ARTICLE HAVING A COEFFICIENT OF THERMAL EXPANSION WHICH MAY BE VAIRED FROM HIGH IN THE DIRECTION PERPENDICULAR TO PRESSING TO EQUAL IN THE DIRECTION PERPENDICULAR TO AND PARALLEL TO PRESSING WHICH COMPRISES THE STEPS OF PRODUCING ACICULAR MELAMINE DIBORATE CRYSTALS BY REACTING MELAMINE AND BORIC ACID IN A HOT AQUEOUS SOLUTION, CONTROL COOLING THE REACTION MIXTURE TO PRODUCE SHORT, MIXED, OR LONG LENGTH ACICULAR CRYSTALS OF MELAMINE DIBORATE AS DESIRED, THERMALLY CONVERTING SAID CONTROLLED LENGTH ACICULAR CRYSTALS OF MELAMINE DIBORATE TO ACICULAR BORON NITRIDE POWDER PARTICLES OF THE SAME SHAPE AS THE STARTING MELAMINE DIBORATE CRYSTALS BY RAPIDLY HEATING THE TO A TEM-
Claim 2
Dependent Claim
112 words
A PROCESS FOR PREPARING A HOT PRESSED BORON NITRIDE ARTICLE HAVING A COEFFICIENT OF THERMAL EXPANSION WHICH MAY BE VAIRED FROM HIGH IN THE DIRECTION PERPENDICULAR TO PRESSING TO EQUAL IN THE DIRECTION PERPENDICULAR TO AND PARALLEL TO PRESSING WHICH COMPRISES THE STEPS OF PRODUCING ACICULAR MELAMINE DIBORATE CRYSTALS BY REACTING MELAMINE AND BORIC ACID IN A HOT AQUEOUS SOLUTION, CONTROL COOLING THE REACTION MIXTURE TO PRODUCE SHORT, MIXED, OR LONG LENGTH ACICULAR CRYSTALS OF MELAMINE DIBORATE AS DESIRED, THERMALLY CONVERTING SAID CONTROLLED LENGTH ACICULAR CRYSTALS OF MELAMINE DIBORATE TO ACICULAR BORON NITRIDE POWDER PARTICLES OF THE SAME SHAPE AS THE STARTING MELAMINE DIBORATE CRYSTALS BY RAPIDLY HEATING THE TO A TEM-
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |