Styrene type resin and production method thereof
CA 2019626 C · Owner: Asahi Kasei Kogyo Kabushiki Kaisha · Inventors: Sho, Kazuhiko; Arito, Yuichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel styrene type resin having excellent strength which comprises specific proportions of styrene type structural units and structural units having a long alkyl chain defined by specific structural formula which has a total amount of styrene type monomer, styrene type dimer, styrene type trimer and solvent of polymerization below a specific amount has been found to have yield point and break point in a tensile stress-strain test. - 64 -
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 June 22, 1990 and granted November 22, 1994. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2012.
- 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.