Process for the preparation of organosilicon compounds carrying sulfur-containing organic radicals
CA 2115662 C · Owner: Wolferseder, Josef · Inventors: Deubzer, Bernward; Wolferseder, Josef; Hager, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
According to a process for preparing organosilicon compounds having having sulphur-containing organic residues organosilicon, compounds made of units having general formula (I) are reacted with sulphite in the presence of water. In the formula (I) R may, be the same or different and stand for a monovalent organic residue; R1 may be the same or different and stand for a hydrogen atom or for a monovalent organic residue; R2 may be the same or different and stand for a residue -QX in which Q stands, for a bivalent hydrocarbon residue and X stands for a halogen atom; a equals 0 1, 2 or 3; b equals 0, 1, 2 or 3 and c equals 0, 1, 2 or 3, provided that the organosilicon compound contains at least …
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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 September 24, 1992 and granted December 23, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 24, 2014.
- 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.