Process for the preparation of diorganotin dicarboxylates
CA 2099319 A1 · Owner: Ciba-Geigy Ag · Inventors: Malzacher, Kornelia; Fuchs, Reiner; Kaufhold, Johannes
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of diorganotin dicarboxylates Abstract of the disclosure:, The invention relates to a process for the preparation of a pulverulent diorganotin dicarboxylate, which comprises reacting a diorganotin oxide of the formula I (I), in which R1 and R2, independently of one another are C1-C18alkyl, at a temperature in the range from 45°C to 70°C in the absence of solvents and adsorbents with a dicarboxylic acid of the formula II, (II), in which R3 is C1-C18alkylene cycloalkylene having 5 to 7 carbon atoms phenylene, C1-C18alkenylene or C1-C8alkylene substituted by 1 or 2 hydroxyl groups or its anhy-, dride, and subjecting the reaction mixture and the product during the …
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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 June 28, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 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.