Foamable polymer composition and foamed article
CA 2010319 C · Owner: Nakagawa, Takasi · Inventors: Yamamoto, Yohzoh; Nakagawa, Takasi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A foamable polymer compositor comprising A at least one cyclo-olefin resin selected from the group consisting of, (A-1) ring-opened polymers derived from cyclo-olefins represented by the following general formula I, (A-2) ring-opened copolymers derived from the cyclo-olefins of general formula I, (A-3) hydrogenation products of the ring-opened polymers (A-1), (A-4) hydrogenation products of the ring-opened copolyers (A-2), and, (A-5) addition polymers of the cycloolefins of general formula I with ethylene, and, (B) a blowing agent wherein n is 0 or a.positive integer; R1 to R12, independently from each other, represent an atom or a.group selected from the class consisting of a hydrogen …
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 February 19, 1990 and granted March 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 19, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 19, 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.