Expired Canadian patentCanada
Process for preparing dye composition containing 5,6- dihydroxyindoles and products
CA 1338378 C · Owner: Clairol Incorporated · Inventors: Murphy, Bryan Patrick; Brown, Keith Charles; Schultz, Thomas Mathew
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for preparing dye compositions which comprises hydrolyzing a 5,6-diacyloxyindole with an alkaline hydrolyzing agent under substantially anaerobic condition and the products made by such process.
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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 June 11, 1996. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 11, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 1, 1986
GrantedJune 11, 1996
Term endedJune 11, 2013
Patent numberCA 1338378 C
Classification (IPC)A61K8/49 +2 more
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.