Phenol/diene novolok resins, process, preparation and rubber-based compounds containing the said resins
CA 2201389 C · Owner: Dreyfus, Thierry · Inventors: Bekhiekh, Messaoud; Dreyfus, Thierry; Morel-Fourrier, Christophe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The purpose of the invention is novolak resins obtained by condensation (A) of an aromatic compound containing at least two hydroxyl groups and (B) a non-conjugated diene in a molar relationship (A) (B) between 0.7 and 1.75 in the presence of an acid catalyst, characterized by a free aromatic compound of less than 5% by weight of the novolak resins with 0 parts of rubber by weight. These rubber-based resins or compounds are for use in vulcanization particularly in tires and conveyor belts.
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 March 27, 1997 and granted January 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 27, 2019.
- 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.