Chloroformyl-functional organopolysiloxane
CA 2035549 C · Owner: Dow Corning Toray Silicone Company, Ltd. · Inventors: Okawa, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is disclosed an organopolysiloxane having a molecular weight of 200 to 100,000 which contains at least one silicon-bonded, chloroformyl group-containing organic group, said organopolysiloxane being prepared by reacting (I) the corresponding organopolysiloxane which contains at least one silicon-bonded, triorganosiloxycarbonyl group-containing organic group; and (II) an inorganic halide, such as thionyl chloride. By virtue of its highly reactive chloroformyl group the, organopolysiloxane of the invention find utility as modifiers for polyamide resins, polyester resins and the, like.
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 1, 1991 and granted September 15, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 1, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 1, 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.