Polyimide, organic film comprising the polyimide, and photoconductive device comprising the organic film
CA 2039945 C · Owner: Kurihara, Suomi · Inventors: Yanagisawa, Yoshihiro; Kurihara, Suomi; Kawada, Haruki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Photoconductive devices are disclosed in which the conversion of light to electric energy is effected by means of an organic film of a novel photoconductive polyimide compound having a carbazole skeleton in the repeating unit thereof. Photoelectric devices according to the invention are particularly useful in solar cells and photosensors by reason of superior environmental stability of the said polyimide compounds and their thinfilm workability.
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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 8, 1991 and granted July 30, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 8, 2013.
- 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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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.