Rubber composition and polynorbornene-based thermoplastic elastomer with improved thermal stability
CA 2033991 C · Owner: Levif, Gabriel · Inventors: Levif, Gabriel; Coupe, Frederic
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a rubber composition with improved heat resistance and a polynorbornene base including a mixture of at least 50% by weight of polynorbornene and at most 50% by weight of another rubber said mixture having been vulcanized by an effective quantity of at least one compound: (I) where R1 R2 = CHnX3-n, with X = F, Cl or Br and n = integral from 0 to 2. The invention also relates to a thermoplastic composition including 10 - 90 parts by weight (pp) of at least one crystal polymer (A) with an olefin base from 90 - 10 pp of a mixture (B) of at least 50% by weight of polynorbornene and at most 50% by weight of another rubber and a quantity of polynorbornene plasticator which …
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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 July 3, 1990 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 3, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 3, 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.