Polyphenylene ether capping process, polyphenylene resins obtained thereby and compositions thereof
CA 2082695 A1 · Owner: Dert, Vincent · Inventors: Aycock, David F.; Aycock, David F.; Dert, Vincent
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are disclosed methods for the preparation of polyphenylene ether resins having increased hydroxyl content and particularly, increased non-Mannich hydroxyl content through the reaction of biphenol with the polyphenylene ether resin. Also disclosed are the polyphenylene ether resins obtained by such processes, as well as the reaction products between such polyphenylene ether resins and hydroxyl-reactive substituents such as epoxy chlorotriazines, and compositions containing such reaction products and thermoplastic resin not normally compatible with polyphenylene ether resin, such as polyester resin.
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 November 12, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 12, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 12, 2014.
- 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.