Patents by Inventor Sundram Krishnamurthy

Sundram Krishnamurthy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Photographic elements containing 2-equivalent pyrazolone couplers and process for their use
    Patent number: 6015657
    Abstract: A photographic element contains at least one photosensitive silver halide emulsion layer having associated therewith a 5-pyrazolone photographic coupler represented by the formula: ##STR1## wherein substituents X.sub.1, X.sub.2, Y, G.sub.1, G.sub.2, G.sub.3, Z, and R.sub.1 may be as specified in the specification; a, b, and c are individually integers form 0 to 3 provided that "a" cannot be an integer which, combined with the selection of X.sub.1 and X.sub.2, allows the number of chloride substituents on the ring containing G.sub.1 to exceed 3; and the sum of the Hammett's sigma values for X.sub.1, X.sub.2, Y, G.sub.1, G.sub.2, and G.sub.3 is at least 1.3.
    Type: Grant
    Filed: January 10, 1994
    Date of Patent: January 18, 2000
    Assignee: Eastman Kodak Company
    Inventors: Sundram Krishnamurthy, Michael William Crawley, David Scott Bailey, John Lawrence Pawlak