Method of manufacturing shaped body made of ferrite crystals of garnet polycrystal structure
CA 2015606 C · Owner: Ngk Insulators, Ltd. · Inventors: Okamoto, Katsunori; Asai, Emi; Imaeda, Minoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing ferrite crystals such as single crystal bodies and polycrystal bodies with garnet structure is disclosed, which includes the steps of effecting a composition controlling of raw powders, forming raw powders sintering formed, bodies and effecting hot isostatic press treatment of sintered bodies. Also, a method of producing ferrite powders preferably used for the ferrite crystal manufacturing method mentioned above. The thus obtained ferrite crystal bodies with garnet structure show good magnetooptical properties such as light transmissivity Faraday rotation angle and Verdet constant and are preferably, used for magnetooptical elements such as optical isolators 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 April 27, 1990 and granted August 4, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 27, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 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.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.