Insulated wire and production process of the insulated wire
CA 2000927 C · Owner: Ohta, Masahiro · Inventors: Saruwatari, Masumi; Nakakura, Toshiyuki; Tsuji, Shoichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The insulated wire having excellent thermal resistance and good surface appearance is obtained by producing from specific polyamide in a temperature range of 300 °C to 450 °C and controlling moisture content to 200 ppm or less in the polyimide used as raw materials. The polyimide has a recurring units of the formula:, (I), (wherein R is a tetravalent radical selected from the group consisting of an aliphatic radical having two or more carbon atoms, a cyclo-aliphatic radical, a monoaromatic radical a, condensed polyaromatic radical and a non-condensed polyaromatic radical wherein the aromatic radicals are mutually connected with a bond or a crosslinking function X is a divalent radical, of 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 October 18, 1989 and granted September 13, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 18, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 18, 2011.
- 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.