Polysiloxane-polyoxyethylene-polyoxypropylene triblock copolymers and defoaming compounds containing them
CA 2191507 C · Owner: Klocker, Otto · Inventors: Karminski, Hans-Leo; Keup, Michael; Sucker, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polysiloxane-polyoxyethylene- polyoxypropylene triblock copolymers having the general formula: (See fig.1), as well as compounds for the defoaming of aqueous dispersion paints that are disclosed contain the copolymers as effective defoaming components.
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 28, 1996 and granted April 23, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 28, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 28, 2018.
- 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.