Process using alumina carbonitriding for the continuous preparation of aluminium nitride
CA 2131475 C · Owner: Ravenel, Pierre · Inventors: Bachelard, Roland; Disson, Jean-Pierre; Ravenel, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Continous process for preparing aluminium nitride by carbonitriding of alumina. According to the process the reaction involving alumina, carbon a binding agent and nitrogen is carried out in a reactor characterized in that the reaction zone consists in at least one pipe having an exchange surface/volume ratio of between 5 and 150 m-1 and preferably between 10 and 50 m-1.
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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
- Filed September 6, 1994 and granted January 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 6, 2016.
- 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
Timeline From CIPO dates
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.