Patents by Inventor Dat Quoc Nguyen

Dat Quoc Nguyen 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).

  • Charge transfer layer with hydrazone, acetosol yellow and antioxidant of butylated p-cresol reacted with dicyclopentadiene
    Publication number: 20020122998
    Abstract: A photoconductor having a charge transport layer in illustrative embodiments of a polycarbonate binder, 30 to 60 percent by weight DEH hydrazone, 0.5 percent to 5 percent acetosol yellow, and 0.5 percent to 5 percent by weight of the butylated reaction product of p-cresol and dicyclopentadiene. The charge generation layer by type IV oxotitanium phthalocyanine in polyvinylbutyral, poly (methyl-phenyl) siloxane and polyhydroxystyrene. Light fatigue is largely eliminated while the physical and cost advantages of DEH are realized.
    Type: Application
    Filed: March 1, 2001
    Publication date: September 5, 2002
    Inventors: Mark Thomas Bellino, David Glenn Black, Gregory W. Haggquist, Ronald Harold Levin, Weimei Luo-Gheleta, Scott Thomas Mosier, Dat Quoc Nguyen, Bradford Lee Taylor, Franklin Dilworth Zartman
  • 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 photoconductor containing high levels of polyolefins as charge transport additives
    Patent number: 6071660
    Abstract: A photoconductor for use in electrophotographic reproduction devices is disclosed. This photoconductor exhibits dramatically reduced end seal and paper area wear, as well as reduced positive electrical fatigue. The photoconductor of the present invention includes a low surface energy polyolefin wax, such as polyethylene or polypropylene, in relatively large particulate form having a mean particle diameter of from about 6 to about 12.mu., homogeneously dispersed in its charge transport layer.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: June 6, 2000
    Assignee: Lexmark International, Inc.
    Inventors: David Glenn Black, Gregory Walter Haggquist, Dat Quoc Nguyen
  • Solution squarylium charge generation systems incorporating binder blends
    Patent number: 6040098
    Abstract: Charge generation layers comprising a binder and a charge generation compound, wherein the binder comprises a blend of methyl bisphenol A and an additional resin comprising an epoxy resin, a poly(phenylglycidyl ether)-co-dicyclopentadiene resin, a phenoxy resin or a polyhydroxystyrene resin. Dual layer photoconductors comprise the charge generation layer in combination with a substrate and a charge transport layer.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: March 21, 2000
    Assignee: Lexmark International, Inc.
    Inventors: David Glenn Black, Garry Dale Hinch, Dat Quoc Nguyen, Kasturi Rangan Srinivasan