Increasing a1n thermal conductivity via vapor-phase carbon
CA 2000839 A1 · Owner: Knudsen, Arne K. · Inventors: Knudsen, Arne K.; Paquette, Mike S.; Knudsen, Arne K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing densified aluminum nitride articles having enhanced thermal conductivity is disclosed. The method comprises the steps of forming a powder compact comprising aluminum nitride alone or in combination with other ceramic compounds, adding a densification aid to the compact, and at least partially densifying the compact via sintering or hot pressing to provide a semidense article. This semi-dense article is thereafter exposed to an atmosphere containing vapor phase carbon for a period of time sufficient to allow the vapor phase carbon to reduce the level of oxygen contained within the article. The article thus produced is a dense aluminum nitride article having a high …
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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 October 17, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 17, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2011.
- 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.