Siloxane copolymers containing vinyloxy groups, their preparation and their use
CA 2134438 A1 · Owner: Wacker-Chemie Gmbh · Inventors: Herzig, Christian; Rengstl, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
New siloxane copolymers having vinyloxy groups contain: (a) siloxane units having the formula (I): RaSi(OR1)bO(4-(a+b))/2 (b) at least one unit per molecule selected among the group of units having the formula (II): GRcSiO(4-(c+1))/2 G =, -CH2CH2OY(OCH=CH2)x-1, and (c) at least one unit per molecule having the formula (VI), in which R, R1 R2, Y, Z, a, b, c, u, x, and y have the meaning given in the first claim.
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 May 6, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 6, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 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.