Magenta dye-forming coupler
CA 1340791 C · Owner: Sato, Tadahisa · Inventors: Sato, Tadahisa; Kimura, Keizo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There are provided 1H-pyrazolo1,5-b-1,2,4triazole magenta couplers or 1H-pyrazolo5,1-c-1,2,4triazole magenta couplers characterized by having at the 6-position a phenoxy group, on the ortho-position of which is an alkoxy group or an aryloxy group. A photographic material comprising the magenta coupler is excellent in color reproducibility and exhibits superior photographic characteristics in any of sensitivity, gradation and, color density.
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 October 19, 1999. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 19, 2016.
- 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.