Carbamic acid derivatives
CA 2104317 A1 · Owner: Karrer, Friedrich · Inventors: Karrer, Friedrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Carbamic acid derivatives, Abstract, Compounds of the formula (I), in which R1 is halogen, C1-C3alkyl halo-C1-C3alkyl, C1-C3alkoxy, halo-C1-C3alkoxy or cyano and/or two substituents R1 which are bonded to adjacent C atoms of the phenyl ring together are -O-CH2-O-; R2 is hydrogen halogen or methyl;, R3 is fluorine, chlorine bromine or C1-C3alkyl; R4 is hydrogen or C1-C3alkyl; either R5 is hydrogen, C1-C4alkyl, , -COCO-R8 -CO-R9, or, S(O)m-N(R10)-COO-R11 and, R6 is C1-C6alkyl halo-C1-C4alkyl, C2-C6alkenyl, halo-C3-C4alkenyl C3-C5alkynyl, halo-C3-C5alkynyl, C1-C3alkoxy-C1-C3alkyl C3-C6cycloalkyl, unsubstituted or, substituted phenyl; or R5 and R6 together are -(CH2)4- or -(CH2)5-; R7 is …
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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 August 18, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 18, 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.