Substituted isoquinolines
CA 1296722 C · Owner: Eastman Kodak Company · Inventors: Hilbert, Samuel D.; Pruett, Wayne P.; Weaver, Max A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel substituted isoquinoline compounds of the formula, wherein, R is lower alkyl, R1 is lower alkylene 1-3 lower alkyleneoxy, groups or lower alkylenethio and, X is one or more substitutents selected from the group consisting of hydroxyl, carbalkoxy carboxy and, acyloxy. These novel substituted isoquinolines can be used as dyes, toners or color bodies, and in particular as toners for polyesters. LE0622F
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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 March 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 2009.
- 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.