Patents by Inventor Sundaram Krishnamurthy

Sundaram 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).

  • Sterically hindered aromatic carboxylic esters
    Patent number: 4827019
    Abstract: Photographic coupler solvents comprising aromatic carboxylic esters such as phthalates and isophthalates having bulky or branched ester substituents are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the cyan layer to protect the cyan dye against ferrous ion reduction. The solvents also provide improvements in yellow dye stability to light, cyan dye stability in the dark and magenta dye stability to heat and light.
    Type: Grant
    Filed: January 12, 1987
    Date of Patent: May 2, 1989
    Assignee: Eastman Kodak Company
    Inventor: Sundaram Krishnamurthy
  • Organic disulfides as image dye stabilizers
    Patent number: 4740438
    Abstract: Photographic stabilizers comprising certain organic disulfide compounds are described for incorporation in photographic emulsions and elements. The compounds are preferably employed in the magneta layer to protect the magneta dye from fading by light.
    Type: Grant
    Filed: December 10, 1986
    Date of Patent: April 26, 1988
    Assignee: Eastman Kodak Company
    Inventor: Sundaram Krishnamurthy
  • Sterically hindered phenolic ester photographic coupler dispersion addenda and photographic elements employing same
    Patent number: 4728599
    Abstract: Photographic coupler dispersion addenda comprising phenolic esters of di-, tri- and tetra-carboxybenzene derivatives having bulky ortho substituents are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the cyan layer to protect the cyan dye against ferrous ion reduction. The solvents also provide improvements in yellow dye stability to light and cyan dye stability to light, heat and humidity.
    Type: Grant
    Filed: December 2, 1985
    Date of Patent: March 1, 1988
    Assignee: Eastman Kodak Company
    Inventor: Sundaram Krishnamurthy
  • Sterically hindered photographic coupler solvents and photographic elements employing same
    Patent number: 4684606
    Abstract: Photographic coupler solvents comprising aromatic carboxylic esters such as phthalates and isophthalates having bulky or branched ester substituents are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the cyan layer to protect the cyan dye against ferrous ion reduction. The solvents also provide improvements in yellow dye stability to light, cyan dye stability in the dark and magenta dye stability to heat and light.
    Type: Grant
    Filed: December 24, 1985
    Date of Patent: August 4, 1987
    Assignee: Eastman Kodak Company
    Inventor: Sundaram Krishnamurthy
  • Photographic coupler solvents and photographic elements employing same
    Patent number: 4540657
    Abstract: Photographic coupler solvents having at least one terminal epoxy group and at least one ester or amide group are described for incorporation in photographic emulsions and elements. The solvents are preferably employed in the magenta layer to reduce background stain produced by exposure to light, heat and humidity.
    Type: Grant
    Filed: June 6, 1984
    Date of Patent: September 10, 1985
    Assignee: Eastman Kodak Company
    Inventor: Sundaram Krishnamurthy