Process for reducing the undesirable halide content of epoxy resins
CA 2035957 A1 · Owner: Bowden, Robert L. · Inventors: Bowden, Robert L.; Wang, Chun S.; Wessels, Mark K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The total aliphatic halide content of epoxy resins is reduced by heating a resin containing hydrolyzable halide or bound halide or both hydrolyzable and bound halide dissolved in a solvent system containing at least one polar aprotic organic solvent which is not a ketone and at least one compound containing at least one aliphatic hydroxyl group per molecule in the presence of a suitable basic-acting compound for a time sufficient to reduce the total undesirable halide content. 37,960-F
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 February 7, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 2013.
- 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.