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US 3,939,176 AGranted
Magenta couplers
AssigneeMinnesota Mining and Manufacturing Company
InventorsMario Gandino, Paolo Beretta
Life of this patent
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Abstract
Magenta couplers of the 5-pyrazolone type which have a phenylcarbamylamino substituent in the 3-position of the pyrazolone nucleus and which have, as a substituent in the 1-position of the pyrazolone nucleus, a 2', 4'-dihalo-6'-alkoxyphenyl group or a 2', 6'-dihalo-4'-alkoxyphenyl group.
Claims4
A color coupler of the formula:
- ##SPC13##
- wherein two of the A groups are halogen, the remaining A group is alkoxy of 1-18 carbon atoms, and R and R.sup.1 are alkoxy or alkyl groups of 5-20 carbon atoms.
Dependencies are inferred from the claim text.