Alkenyloxy-functional organosilicon compounds, their preparation and use
CA 2014591 C · Owner: Wacker-Chemie G.M.B.H. · Inventors: Herzig, Christian; Gilch, Doris
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel, alkenyloxy-functional organosilicon compounds are described which contain at least one Si-bonded Y radical per molecule having the formula -(CH2)2-R2-(A-R3)z-O-CH=CR-CH2-R4 (I) in which, A represents -O-, -S- or , R2 represents a linear or branched alkylene radical having from 1 to 7 carbon atom(s) per radical or a cycloalkylene radical having from 5 to 7 carbon atoms per radical, R3 represents a linear or branched alkylene radical having from 2 to 4 carbon atoms per radical which may be substituted by a hydroxyl group methoxy group, ethoxy group or trimethylsiloxy group R4 represents a, hydrogen atom or an alkyl radical having from 1 to 4 carbon atom(s) per radical, and z is 0, 1 …
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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 April 12, 1990 and granted September 30, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 12, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 12, 2012.
- 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.