Isatineoxime derivatives, their preparation and use
CA 2076948 C · Owner: Jensen, Leif H. · Inventors: Jensen, Leif H.; Watjen, Frank; Drejer, Jorgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound having the formula, (See formula I) wherein, R4 and R5 independently are hydrogen halogen, CF3, CN, NO2 or, SO2NR1R2 wherein R1 is hydrogen or straight, C1-6-alkyl which may be branched or cyclic, R2 is hydrogen or straight, C1-6-alkyl which may be branched or cyclic, or wherein R1 and R2 together represent -(CH2)n;-A-(CH2)m-. wherein A is O S, CH2 or NR I, wherein R I is H, C1-6-alkyl which may be straight, branched or cyclic n is 0, 1, 2, 3, 4, 5 and m is 0, 1, 2 3, 4, 5;, Q is NOH, O;, Z = O, S, N-R II (See formulas) wherein R II, R III, R IV and R V independently are hydrogen benzyl, C1-6-aryl, C1-6-, alkoxy which may be branched or cyclic or C1-6-alkyl which, may be branched …
Read the whole patent
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 August 26, 1992 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 26, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 26, 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.