Patent US2974013A successfully refreshed from Google Patents.
US2974013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boron nitride production
Assignee: Union Carbide Corp
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Filing: 1957-08-13
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Granted: 1961-03-07
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Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Litz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C01; C01B; C01B21/00; C01B21/06; C01B21/064
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A PROCESS FOR PREPARING BORON NITRIDE WHICH COMPRISES DISPERSING IN A MOLTEN BATH OF AT LEAST ON RELATIVELY NON-VOLATILE METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HALIDES AND ALKALINE EARTH METAL HALIDES, A BORON-CONTAINING REACTANT WHICH IS CHOSEN FROM THE GROUP CONSISTING OF ACIDS OF BORON, ANHYDRIDES AND METAL SALTS THEREOF, MIXTURES OF CALCIUM OXIDE AND BORIC OXIDE, AND MIXTURES OF LEAD OXIDE AND BORIC OXIDE THEREBY FORMING A MOLTEN REACTION MIXTURE, INTRODUCING GASEOUS AMMONIA INTO SAID RESULTANT MOLTEN REACTION MIXTURE, REACTING SAID BORON CONTAINING REACTANT AND AMMONIA WHILE MAINTAINING SAID MOLTEN REACTION MIXTURE AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 600$C. TO TO ABOUT 950$C. TO FORM BORON NITRIDE, AND SEPARATING THE BORON NITRIDE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
124 words
A PROCESS FOR PREPARING BORON NITRIDE WHICH COMPRISES DISPERSING IN A MOLTEN BATH OF AT LEAST ON RELATIVELY NON-VOLATILE METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HALIDES AND ALKALINE EARTH METAL HALIDES, A BORON-CONTAINING REACTANT WHICH IS CHOSEN FROM THE GROUP CONSISTING OF ACIDS OF BORON, ANHYDRIDES AND METAL SALTS THEREOF, MIXTURES OF CALCIUM OXIDE AND BORIC OXIDE, AND MIXTURES OF LEAD OXIDE AND BORIC OXIDE THEREBY FORMING A MOLTEN REACTION MIXTURE, INTRODUCING GASEOUS AMMONIA INTO SAID RESULTANT MOLTEN REACTION MIXTURE, REACTING SAID BORON CONTAINING REACTANT AND AMMONIA WHILE MAINTAINING SAID MOLTEN REACTION MIXTURE AT A TEMPERATURE IN THE RANGE OF FROM ABOUT 600$C. TO TO ABOUT 950$C. TO FORM BORON NITRIDE, AND SEPARATING THE BORON NITRIDE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US1077712A
Cited
GB277715A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |