Polyacene derivatives and process of producing thereof
CA 2401487 C · Owner: Japan Science And Technology Agency · Inventors: Takahashi, Tamotsu
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 polyacene derivatives represented by general formula (I) below:, (see formula I) (wherein R1 to R10, etc. each represents hydrogen atom hydrocarbon group, or , an , alkoxy group; A1 and A2 are hydrogen atom a halogen atom, a hydrocarbon , group, an alkoxy group cyano group, etc.; n is an integer of not less than 1; R6 and R7 may , be linked to each other to form a ring); and a process for preparing the polyacene , derivatives from polyhydro compounds as well as electrically conductive materials , comprising the polyacene derivatives. According to the process for preparing the , polyacene derivatives of the present invention optional substituents can be …
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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 28, 2001 and granted June 21, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 28, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2023.
- 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.