Polyarylate and process for preparing the same
CA 2040852 A1 · Owner: Matsumoto, Shigemi · Inventors: Matsumoto, Shigemi; Asada, Masahiro; Yoshida, Tatsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyarylate comprising units derived from an aromatic carboxylic acid compound and units derived from a bisphenol compound and containing an epoxy group. According to the process of the present invention the, polyarylate having epoxy group can be economically prepared. Since the polyarylate of the present invention has epoxy group, it has the reactivity with amino group, hydroxyl group, acid anhydride group or, the like. Therefore, the polyarylate is mixed with another polymer to give a polymer alloy or is utilized as the precursor of a graft-copolymer, utilizing the reactivity.
Read the whole patent
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 19, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 19, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 19, 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
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.