Light transmitting yttria sintered body and its preparation
CA 2011248 C · Owner: Shibata, Kenichiro · Inventors: Shibata, Kenichiro; Fujii, Akihito
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a light transmitting yttria sintered body having good light transmission, which can be prepared by a method comprising the steps of densifying yttria powder having a purity of not lower than 99.9 % and a BET specific surface area of not smaller than 10 m2/g by a hot press at a temperature of 1300 to 1700°C under a pressure of 100 to 500 kg/cm2 under vacuum conditions so as to achieve the theoretical density ratio of not lower than 95 % and then hot isotropically pressing densified yttria at a temperature of 1400 to 1900°C under a pressure of not lower than 500 kg/cm2. The light transmitting yttria sintered body of the present invention is suitable for …
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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 March 1, 1990 and granted September 28, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 1, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 2012.
- 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.