N-n'-disubstituted and n,n,n'-or n,n',n'-trisubstituted thioureas
CA 2022221 C · Owner: Kleinschmit, Peter · Inventors: Deschler, Ulrich; Panster, Peter; Kleinschmit, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides N,N'-disubstituted and N,N,N'- or N N',N'-trisubstituted thioureas with additional organyloxysilyl and tertiary amine functions and a process, for their production, of the general formula (see formula I), in which:, b is 0, 1 or 2; R is alkyl with 1 to 6 carbon atoms, cycloalkyl with 5 to 7 C atoms, aryl or aralkyl;, X is -CH2- when a = 1 3, 4, 5 or 6; or, X is, (see formula II) when a = 1;, R1 and R2 are both hydrogen; or, R1 is hydrogen and R2 is, (see formula III) or, R1 is or (see formula IV) (CH2)n-NR3 2 and R2 is hydrogen; R3 is alkyl with 1 to 3 C atoms; and, n is 1 to 6
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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 July 30, 1990 and granted April 3, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 30, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 30, 2012.
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Timeline
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Sources & verification
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.