Silicon nitride sintered bodies and method of manufacturing the same
CA 2016336 C · Owner: Matsuhiro, Keiji · Inventors: Matsuhiro, Keiji; Takahashi, Tomonori; Isomura, Manabu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Silicon nitride sintered bodies are disclosed which contain silicon carbide therein and in which intergranular phases between silicon nitride particles are substantially crystallized. Additionally, a manufacturing method of the sintered bodies is disclosed, in which a silicon carbide powdery raw material is used as an additive when preparing raw powders and the intergranular phases are crystallized during a cooling stage following a firing. Densification of the structure of the sintered body and crystallization of the intergranular phases occurs by this method thereby making it, possible to produce sintered bodies having intergranular phases with few glass phases uncrystallized and …
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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 May 9, 1990 and granted October 29, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2012.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.