Additives for synthetic resins
CA 1305570 C · Owner: Matsueda, Hirokazu · Inventors: Kinoshita, Mitsuo; Matsueda, Hirokazu; Imamura, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An additive for synthetic resins contains a block copolymer having as its constituent segments both polyester part obtainable by ring-opening polymerization of .epsilon.-aliphatic lactone and polydiene compound part. One or more of these polyester parts are connected to the polydiene compound part through ester bond and at least one of these polyester parts has at its end a reactive group such as vinyl group, epoxy group, isocyanate group or carboxyl group.
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
- Granted July 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 2009.
- 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.