Patents Represented by Attorney John E. Crowe

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  • Photosensitive binder layer for xerography containing titanium oxide and a cadmium pigment
    Patent number: 3969113
    Abstract: A photoconductive binder layer comprising a particulate mixture of photosensitive titanium dioxide and photosensitive cadmium pigment dispersed in an insulating resin binder.
    Type: Grant
    Filed: July 23, 1973
    Date of Patent: July 13, 1976
    Assignee: Rank Xerox Ltd.
    Inventor: Hajime Miyatuka
  • Active matrix and intrinsic photoconductive polymer
    Patent number: 3957725
    Abstract: A process for obtaining a substantially linear homopolymer and/or copolymeric material from a cyclic trimer such as 1,3,5-trimethyl-1,3,5-tri(N-ethyl-3-carbazyl)cyclobisiloxane alone or in combination with cyclic trimers or tetramers exemplified by the formulae ##EQU1## in the presence of tetramethylammonium silanolate or corresponding alkali metal salt as initiators; the polymeric product, and photoconductive members utilizing such product demonstrate excellent structural and electronic properties for xerographic purposes.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: May 18, 1976
    Assignee: Xerox Corporation
    Inventor: William W. Limburg
  • Developing systems
    Patent number: 3942474
    Abstract: A development system comprising a small compact modular developer unit which is retractably engagable with an image bearing surface is provided. The developer module contains within its casing developer feed and doctoring systems to provide a developer applicator surface containing appropriate quantities of developer. The system may use liquid and powder developers and is capable of high speed operation.
    Type: Grant
    Filed: September 13, 1974
    Date of Patent: March 9, 1976
    Assignee: Xerox Corporation
    Inventors: Richard E. Smith, Jack R. Oagley
  • Electrophotographic element with ZnO and TiO.sub.2
    Patent number: 3941594
    Abstract: A photosensitive member for electrophotographic use having a photosensitive binder layer comprising zinc oxide and titanium dioxide photoconductive particles blended in a ratio of about 50:50 to 80:20 by weight and homogeneously dispersed into a film forming insulating resin binder, the particles having an average size of about 0.05 micron to 1.0 micron and the zinc oxide and titanium dioxide particles diffusing in light sensitivity by a factor of more than about 1.2 based on a gray filtered mean daylight source.
    Type: Grant
    Filed: July 25, 1973
    Date of Patent: March 2, 1976
    Assignee: Rank Xerox Ltd.
    Inventors: Satoru Honjo, Hajime Miyatuka
  • Polyvinylpyrenal--an intrinsic photoconductor and active matrix polymer
    Patent number: 3941750
    Abstract: A polyvinylpyrenal copolymer obtained by condensing the corresponding aromatic aldehyde with a copolymer of vinyl alcohol and having a number average molecular weight of at least 5,000. Also included are photoconductive members utilizing such material as an intrinsic photoconductor or as matrix material, demonstrating excellent structural and electronic properties for xerographic purposes.
    Type: Grant
    Filed: September 19, 1974
    Date of Patent: March 2, 1976
    Assignee: Xerox Corporation
    Inventor: William W. Limburg
  • Accelerating aging method for selenium-arsenic photoconductors
    Patent number: 3930853
    Abstract: A method for expediting the breaking in or aging of xerographic photoreceptors comprising a substrate and at least one selenium and arsenic-containing photoconductor layers and to improve low density image differentiation by initially exposing the photoconductor layers to a visible or ultraviolet light flux while at a temperature of not less than about 85.degree.C.
    Type: Grant
    Filed: December 6, 1973
    Date of Patent: January 6, 1976
    Assignee: Xerox Corporation
    Inventor: Anthony J. Ciuffini