Indoloisoquinoline derivatives
CA 1101418 A · Owner: Sumitomo Chemical Co. Ltd. · Inventors: Katsube, Junki; Ishizumi, Kikuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Indoloisoquinaoline derivatives of the formula wherein R1 and R4 are each hydrogen, a halogen nitro or a, lower alkoxy and R2 is hydrogen a lower alkyl, a lower alkenyl, a C3 - C6 cylcloalkyl C1-C3 alkyl or a group of the formula or -A-O-B wherein A is a C1-C7 alkylene R3 is hydrogen, a lower alkyl, a lower alkenyl a C3-C6-cycloalkyl C1-3 alkyl or, a group of the formula or -A-O-B wherein A is a, straight or branched C1-7 alkylene R5 and R6 are each hydrogen, or a lower alkyl or, when taken together with the adjacent nitrogen atom, form a morpholine ring and B is hydrogen a lower, both R1 and R4 are hydrogen and R3 is methyl then R2 can not be, hydrogen, or a pharmaceutically acceptable …
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
- Granted May 19, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 19, 1998.
- 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.