Macrocylic compounds
CA 1341176 C · Owner: Raduchel, Bernd · Inventors: Speck, Ulrich; Gries, Heinz; Weinmann, Hans-Joachim
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1,4,7,10-Tetraazacyclododecanes of general Formula II (see formula II), wherein:, each R1, independently of each other is hydrogen or metal, ion equivalent of a complexible metal; R2 is a linear or branched, saturated or unsaturated hydrocarbyl, acyl or acyl-alkylene group each of 1-16 carbon atoms substituted by from 1 to 10 hydroxy or lower alkoxy groups, -CH2-X-V wherein, X is carbonyl alkylene of 0-10 carbon atoms, optionally substituted by hydroxy and/or lower alkoxy or alkylene of 5-23 carbon atoms interrupted by oxygen atoms, V is (see formula III) or -COOR6 wherein, R3 and R4, independently of each other each is, hydrogen, alkyl of 1-16 carbon atoms or alkyl of, 1-16 C-atoms …
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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
- Granted January 30, 2001. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 30, 2018.
- 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.