Patents by Inventor Kasturi R. Srinivasan

Kasturi R. Srinivasan 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).

  • Photoconductors comprising cyclic carbonate polymers
    Patent number: 6489070
    Abstract: A photoconductor comprises a substrate and a charge generation layer comprising cyclic carbonate polymer and a charge generation molecule. The photoconductor exhibits improved electrical characteristics.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: December 3, 2002
    Assignee: Lexmark International, Inc.
    Inventor: Kasturi R. Srinivasan
  • Electrophotographic photoconductors comprising polyaryl ethers
    Patent number: 6350553
    Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof; and mixtures thereof.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: February 26, 2002
    Assignee: Lexmark International, Inc.
    Inventor: Kasturi R. Srinivasan
  • Charge transport layers and/or charge generation layers comprising unsaturated aliphatic hydrocarbons and photoconductors including the same
    Patent number: 6309784
    Abstract: Charge generation layers comprise a binder including an unsaturated aliphatic hydrocarbon and charge generation compound, wherein the unsaturated, aliphatic hydrocarbon comprises at least 10 carbon atoms. Charge transport layers comprise one or more unsaturated aliphatic hydrocarbons and a charge transport compound, wherein the unsaturated hydrocarbon comprises at least 10 carbon atoms. Dual layer photoconductors comprise a substrate, a charge transport layer and a charge generation layer, wherein at least one of the charge generation layer or charge transport layer comprise one or more unsaturated aliphatic hydrocarbons having at least 10 carbon atoms.
    Type: Grant
    Filed: February 14, 2000
    Date of Patent: October 30, 2001
    Assignee: Lexmark International, Inc.
    Inventors: David Glenn Black, Dat Quoc Nguyen, Kasturi R. Srinivasan
  • Electrophotographic photoconductors comprising polyaryl ethers
    Publication number: 20010023047
    Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof; and mixtures thereof.
    Type: Application
    Filed: January 23, 2001
    Publication date: September 20, 2001
    Inventor: Kasturi R. Srinivasan
  • Electrophotographic photoconductors comprising polaryl ethers
    Patent number: 6232025
    Abstract: A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof, and mixtures thereof.
    Type: Grant
    Filed: January 10, 2000
    Date of Patent: May 15, 2001
    Assignee: Lexmark International, Inc.
    Inventor: Kasturi R. Srinivasan
  • Aromatic benzobisazole polymers and copolymers incorporating diphenylamino moieties
    Patent number: 5633337
    Abstract: A polymer having repeating units of the formula: ##STR1## wherein Q is ##STR2## wherein X is --NH--, --S-- or --O--. A copolymer having repeating units of the formula: ##STR3## wherein x has a value of 0.01 to 0.99 and Q is ##STR4## wherein X is --NH--, --S-- or --O--.
    Type: Grant
    Filed: February 23, 1996
    Date of Patent: May 27, 1997
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Kasturi R. Srinivasan
  • Triarylamine-based dinitrile and dicarboxylic acid monomers
    Patent number: 5536866
    Abstract: Triarylamino-based dinitrile and dicarboxylic acid monomers as represented by the formula: ##STR1## wherein Z is --CN or --COOH and R is selected from the group consisting of --H, --CH.sub.3, --N(CH.sub.3).sub.2 and --OH.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: July 16, 1996
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Kasturi R. Srinivasan
  • Benzobisazole polymers containing triarylamino moieties
    Patent number: 5534613
    Abstract: Polymers of the class rigid-rod aromatic heterocyclic polymers, having repeating units of the formula: ##STR1## wherein R is selected from the group consisting of --H, --CH.sub.3, --N(CH.sub.3).sub.2 and --OH, and Q is ##STR2## wherein X is --S-- or --O--, exhibit increased electrical conductivity, as compared to rigid-rod aromatic heterocyclic polymers polymers not containing the triarylamino moiety.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: July 9, 1996
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Kasturi R. Srinivasan
  • Benzobisazole copolymers containing triarylamino moieties
    Patent number: 5521277
    Abstract: A copolymer having repeating units of the formula: ##STR1## wherein R is selected from the group consisting of --H, --CH.sub.3, --N(CH.sub.3).sub.2 and --OH, x has a value of 0.01 to 0.99 and Q is ##STR2## wherein X is --S-- or --O--.
    Type: Grant
    Filed: January 26, 1995
    Date of Patent: May 28, 1996
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Loon-Seng Tan, Kasturi R. Srinivasan