Phenolic resin compositions
CA 2012052 C · Owner: Ireland, John · Inventors: Baker, Derek William; Ireland, John; Lemon, Peter Herbert Richard Bryan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A phenolic resin composition comprises an ester-curable phenol-aldehyde resin in, alkaline aqueous solution wherein the phenol-aldehyde resin is a methylolated phenolic novolak resin. Preferably, during manufacture of the methylolated phenolic, novolak resin, unreacted phenol is removed. The composition may be employed for, reaction with an organic ester hardener as a binder in the production of , foundry moulds and cores having high strength. The further incorporation of an aryloxy alcohol in the novolak resin binder additionally improves the final strength of, products obtained by a gas curing technique using ester vapour such as that , of, methyl formate.
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 13, 1990 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 13, 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.