Aqueous dispersions of organopolysiloxanes
CA 2136491 C · Owner: Braunsperger, Karl · Inventors: Oberneder, Stefan; Braun, Rudolf; Braunsperger, Karl
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous dispersions of organopolysiloxanes which are free from organic transition metal compounds and organic compounds of metals of main group III, IV and V and can be prepared using the starting substances, (A) organopolysiloxane containing groups which can undergo condensation, (B) organopolysiloxane resin having a molecular weight of not more than 20,000 and, (C) compound containing basic nitrogen.
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 23, 1994 and granted January 5, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2016.
- 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.