Process for production of varistor material
CA 1315529 C · Owner: Somar Corporation · Inventors: Zenbee, Nakagawa; Igari, Akihide; Ochi, Hideo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of a varistor material having a nonlinear index (a) of at least 20 which comprises adding a manganese compound to zinc oxide; heating the obtained mixture in the form of a powder in the atmosphere at 1050 to 1150°C; grinding the material to give a particle size of 150 mesh or below; molding the powder into a desired shape; and sintering the same at 1200 to 1350°C; is disclosed.
Read the whole patent
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
- Granted April 6, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 6, 2010.
- 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.