Bis-pyrazolone for color photography
United States Patent 2706683
US Patent References:
Production of colored photographic images
- - 2213986
Chemical process and composition
- - 2294909
4,4'-bis (pyrazolone) couplers for color photography
- - 2411951
4, 4'-bis (pyrazolone-1-carboxamide and thiocarboxamide) couplers for color photography
- - 2435550
Production of colored photographic images
- - 2213986
Chemical process and composition
- - 2294909
4,4'-bis (pyrazolone) couplers for color photography
- - 2411951
4, 4'-bis (pyrazolone-1-carboxamide and thiocarboxamide) couplers for color photography
- - 2435550
Inventors:
Sawdey, George W.
Publication Date:
04/19/1955
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Export Citation:
Assignee:
EASTMAN KODAK CO
Primary Class:
Other Classes:
548/368.700, 430/555, 548/371.100, 548/365.400, 548/368.400
International Classes:
C07D231/52; C07D417/14; G03C7/384; C07D231/00; C07D417/00; G03C7/38