Modified polyalkoxy epoxy resins, a process for preparing them, and their use
CA 2082599 C · Owner: Ciba Spezialitatenchemie Bergkamen Gmbh · Inventors: Scherzer, Wolfgang; Neffgen, Bernd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to modified polyoxyalkylene epoxy resins based on polyhydric phenols and prepared by the addition of polyethers and/or polyether monourethanes containing isocyanate groups to higher-moleecular-weight polyhydric glycidyl compounds, and to the use of these reaction products in the preparation of stable aqueous dispersions.
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 10, 1992 and granted May 2, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 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.