Aqueous dispersions of organopolysiloxanes
CA 2096091 C · Owner: Wacker-Chemie G.M.B.H. · Inventors: Braun, Rudolf; Oberneder, Stefan; Braunsperger, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Aqueous dispersions of organopolysiloxanes useful in the preparation of elastomers comprise (A) an organopolysiloxane containing groups which are capable of condensation, (B) a condensation catalyst (C) an , organopolysiloxane, resin having a molecular weight of not more than 20,000 (D) a compound, containing basic nitrogen and (E) polyvinyl alcohol. The aqueous dispersions are, preferably prepared by dissolving the organopolysiloxane resin (C) in the organopolysiloxane (A) and then emulsifying the solution with polyvinyl alcohol (E) and water.
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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 May 12, 1993 and granted February 29, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 12, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 12, 2015.
- 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.