Zinc oxide varistor and process for the production thereof
CA 2107906 C · Owner: Mutoh, Naoki · Inventors: Katsumata, Masaaki; Koyama, Kazushige; Mutoh, Naoki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a zinc oxide varistor which is provided with a varistor element 1 whose, main component is zinc oxide, and at least two electrodes 2 fitted up on said varistor element 1, and a process for the production thereof. By means of diffusing the following lead borosilicate-type glass into said varistor element 1 from a surface of a fired varistor 1, the improvement in voltage nonlinearity has been accomplished said lead, borosilicate-type glass containing at least one metal oxide selected out of cobalt oxide, magnesium oxide yttrium, oxide, antimony oxide, manganese oxide tellurium oxide, lanthanum oxide, cerium oxide praseodium oxide, neodymium, oxide, samarium …
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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 February 24, 1993 and granted May 5, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 24, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 24, 2015.
- 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.