Method for production of high purity aluminum nitrides
CA 1301430 C · Owner: Schleich, Donald M. · Inventors: Schleich, Donald M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An efficient low-temperature process for the, preparation of highly pure free-flowing aluminum nitride, powder without oxygen contamination comprising the, steps of:, (1) forming a mixture of (a) (CH3)3-Si-?-Si-(CH3)3, and, (b) AlCl3; (2) reacting the mixture formed in step (1) at a temperature of from 0°C to 150°C and thereby forming, H, Cl2-Al-N, Si(CH3)3 ;, (3) maintaining the C12-Al-NH-Si(CH3)3 formed in step (2) at a temperature of from 170°C to 200°C and thereby forming Cl-Al-NH and (CH3)3-SiCl; and, (4) maintaining the Cl-Al-NH formed in step (3) at a temperature of at least 450°C and thereby forming H2, Cl2, and AlN.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 26, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.