Thermally-stabilized thermoplastic compositions which contain polyphenylene ether and conjugated diene polymers
CA 2029533 A1 · Owner: Aycock, David F. · Inventors: Aycock, David F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved thermoplastic composition is described herein, comprising polyphenylene ether resin at least one, conjugated diene polymer or blend containing such a polymer and an effective amount of an organic or inorganic nitrite material, Such compositions exhibit excellent thermal stability during blending or other processing operations. Also described herein is an improved method for preparing thermally stable compositions based on polyphenylene ethers and diene materials.
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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 November 8, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 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.