Process for the preparation of salt free, water free 3-isothiazolone compounds
CA 2033590 A1 · Owner: Pendell, Barry J. · Inventors: Pendell, Barry J.; Leister, Norman A.; Petigara, Ramesh B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing a 3-isothiazolone of the formula wherein, Y is selected from the group consisting of alkyl or substituted alkyl of 1 to 10 carbon atoms; unsubstituted or halogen-substituted alkenyl or alkynyl of 2 to 10 carbon atoms; and aralkyl or halogenlower alkyl-, or lower alkoxy-substituted aralkyl of up to 10 carbon atoms;, X is hydrogen or a (C1-C2) alkyl; and X1 is hydrogen, chlorine, or a (C1-C2) alkyl; comprising (a) reacting anhydrous ammonia with an isothiazolone salt of the formula, wherein, Z is chlorine, bromine sulfate or fluorosulfonate;, m is 1 when Z is chlorine bromine ot fluorosulfonate, and m is, 2 when Z is sulfate; and (b) separating the resultant (NH4)mZ …
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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 January 3, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 3, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 3, 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.