Polyester amide copolymer and method of producing the same, polyester amide monomer and method of producing the same, and polyester amide resin composition
CA 2225792 A1 · Owner: Kanomata, Akinori · Inventors: Kanomata, Akinori; Yamauchi, Kouji; Inoue, Toshihide
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polyester amide copolymer substantially composed of repeating structural units represented by general formula (1) and characterized in that when the contents (mole %) of the three kinds of diacid sequences of general formulae (2), (3) and (4) in the copolymer are referred to as X Y and Z respectively , (with the proviso that the sum of X Y and Z is 100), X satisfies the , relationship: 70 X 100 wherein R1, R2 and R3 are each a divalent substituted or unsubstituted aliphatic alicyclic or aromatic group.
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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 23, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2019.
- 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.