US3607046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aluminum nitride
Assignee: Motors Liquidation Co
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Filing: 1968-09-03
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Granted: 1971-09-21
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Expires: 1988-09-03
Abstract
Abstract Aluminum nitride is formed in a reaction conducted at about normal atmospheric pressure by bringing together pure aluminum and a small amount of lithium under dry conditions and heating these two metals in the presence of nitrogen. In a preferred embodiment the reaction system is heated to a temperature of about 400* C. to 1,100* C. whereby nitrogen reacts with lithium to form lithium nitride which, in turn, readily reacts with aluminum to form lithium and the desired aluminum nitride. Since under suitable reaction conditions lithium is regenerated so long as unreacted aluminum is present, only a substantially catalytic amount of lithium is employed.
Inventors
- 👤 Charles M Little
- 👤 Richard A Murie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:44
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/06; C01B21/072; C01B21/0722
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A method of synthesizing aluminum nitride comprising preparing a mixture of about 100 parts by weight aluminum and from about one-half to three parts by weight lithium in a dry environment, heating said mixture at a temperature in the range of about 400* C. to 1,100* C. in the presence of dry nitrogen at about normal atmospheric pressure for a suitable period until no additional nitrogen is consumed by the reaction mixture and then cooling the reaction mixture below said temperature range, whereby said aluminum is converted to aluminum nitride.
Claim 2
Independent Claim
121 words
A method of synthesizing aluminum nitride comprising preparing a mixture of about 100 parts by weight aluminum and from about one-half to three parts by weight lithium in a dry environment, heating said mixture at a temperature in the range of about 400* C. to 1,100* C. in the presence of dry nitrogen at about normal atmospheric pressure until such time as no additional nitrogen is consumed by the reaction mixture, chlorinating said reaction mixture so as to convert any lithium or lithium nitride to lithium chloride, cooling the chlorination reaction mixture to a suitable temperature below said temperature range and extracting said lithium chloride from said chlorination reaction mixture with a solvent, the nonextracted residue being substantially pure aluminum nitride.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |