Electroconductive article, method of producing same, and motor produced from the article
CA 2091126 C · Owner: Takahashi, Masashi · Inventors: Kanai, Hitoshi; Itoh, Yoshiyasu; Takahashi, Masashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electroconductive material has at least one portion in which the electrical resistance varies continuously along a gradient. Accordingly since the, material is not formed by directly bonding different elements, it does not have a weak joint portion. Further since other material characteristics basides electrical resistance also vary along a gradient for, instance, when the material is used at a high or low temperature, a large thermal stress does not generate at an interface between different elements of the material due to a difference of thermal expansion coefficients of such elements. A method of producing an electroconductive material comprises the steps of adding and additive to a …
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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 5, 1993 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 5, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 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
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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.