Patents Examined by John D. Welsh
  • Conductive single component magnetic toner for use in electronic printing devices
    Patent number: 4451837
    Abstract: An improved conductive single component magnetic dry toner composition for use in developing images in electronic printing systems of a conductivity of from 10.sup.-6 to 10.sup.-8 (ohms/cm).sup.
    Type: Grant
    Filed: June 1, 1982
    Date of Patent: May 29, 1984
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, John F. Knapp
  • Laminated photosensitive plate for electrophotography and process for preparation thereof
    Patent number: 4451549
    Abstract: Disclosed is a laminated photosensitive plate for electrophotography, which comprises a conductive substrate, a layer capable of forming a movable carrier by absorption of light, which is formed on the substrate, and a positive hole-moving layer formed on the movable carrier-generating layer, wherein the movable carrier-generating layer is comprised of a matrix comprising a vinyl pyrrolidone type polymer and an electron-receptive substance and a photoconductive organic pigment dispersed in the matrix.This laminated photosensitive plate is excellent in the sensitivity, initial saturation voltage, smoothness and mechanical strength.
    Type: Grant
    Filed: December 30, 1982
    Date of Patent: May 29, 1984
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Yoshiaki Kato
  • Image forming method and device for same
    Patent number: 4448867
    Abstract: A method for forming images comprises applying voltage or electric charge to one or more electrodes selected from an electrode group comprising electrodes each of which has a transistor and attaching a toner to the selected electrodes. A device for forming images comprises an electrode group and a toner supplying device, each of electrodes of the electrode group being provided with a transistor.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: May 15, 1984
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yukitoshi Ohkubo, Yoshiyuki Osada, Masao Sugata, Takashi Nakagiri
  • Organic photosensitive material for electrophotography comprising polyvinylcarbazole and pyrene or phenanthrene
    Patent number: 4447514
    Abstract: Disclosed is an organic photosensitive material for electrophotography comprising a charge-transporting medium composed mainly of polyvinyl carbazole and a perylene type pigment as a charge-generating pigment dispersed in said charge-transporting medium, wherein 1 to 30 parts by weight of a halo-naphthoquinone and 1 to 100 parts by weight of phenanthrene or pyrene are incorporated per 100 parts by weight of the polyvinyl carbazole.This photosensitive material is excellent in the sensitivity and the resistance to the repeated light exposure.
    Type: Grant
    Filed: March 4, 1983
    Date of Patent: May 8, 1984
    Assignee: Mita Industrial Co., Ltd.
    Inventors: Toru Nakazawa, Akira Fushida, Yasushi Kamezaki
  • Photoconductive composition and electrophotographic light-sensitive material using it
    Patent number: 4447515
    Abstract: A photoconductive composition is disclosed which is comprised of an organic photoconductor and a diacylamine compound. The composition may also contain a sensitizing dye for sensitizing the organic photoconductor. In addition there is disclosed an electrophotographic light-sensitive material having on a conductive support a photoconductive light-sensitive layer composed of the foregoing photoconductive composition. The addition of the diacylamine compound greatly increases the light sensitivity of the photoconductive composition containing an organic photoconductor.
    Type: Grant
    Filed: January 28, 1983
    Date of Patent: May 8, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Syun-ichi Kondo, Kenji Sano, Hideo Sato
  • Photo sensitive article for electrophotography containing charge transfer material
    Patent number: 4444861
    Abstract: An electrophotographic sensitive article comprising an electroconductive substrate and a photoconductive layer formed on said substrate and composed of an electric charge generating substance and an electric charge transfer substance, which sensitive article is characterized by said electric charge transfer substance having as an active component thereof a polyester obtained from a diol component consisting preponderantly of 2,6-dimethoxy-9,10-anthracene diol and a dicarboxylic acid component consisting preponderantly of .alpha.,.omega.-dicarboxylic acid. This electrophotographic sensitive article has remarkable sensitiveness and processability.
    Type: Grant
    Filed: December 10, 1982
    Date of Patent: April 24, 1984
    Assignee: Ashai Kasei Kogyo Kabushiki Kaisha
    Inventors: Sumitaka Nogami, Yoshiharu Kitahama, Isamu Iwami
  • Electrophotographic photosensitive materials having layer of organic metal compound
    Patent number: 4444862
    Abstract: An electrophotographic photosensitive material is disclosed. The material is comprised of a conductive support base. On the surface of the base is a photoconductive layer. On a surface of the photoconductive layer is an interlayer comprised of organic metal compound as its main component. On top of the interlayer is a low-resistant protective layer. The material can achieve electrostatic contrast greatly superior to that of conventional photosensitive materials.
    Type: Grant
    Filed: July 28, 1982
    Date of Patent: April 24, 1984
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Shigeru Yagi, Koichi Yamamoto, Yasutoshi Okugawa
  • Layered persistent photoconductive element comprises pigment layer and polymer layer containing polyvinyl carbazole
    Patent number: 4444860
    Abstract: A persistent photoconductive element comprising an electroconductive support, a pigment layer formed on said support and composed mainly of a phthalocyanine pigment or Indanthrene Blue GCD and a polymer layer formed on said pigment layer and composed mainly of a polyvinyl carbazole, said polymer layer containing at least one member selected from the group consisting of aliphatic halogenated hydrocarbons, halogenated acyl compounds, halogenated keto compounds and hydrogen donor compounds. This element exhibits an improved photoconductive sensitivity and prolonged photoconductivity over the prior art, whereby it is highly useful in electrophotographic processes requiring persistent photoconductivity. Additives, such as plasticizer and binding agent, may be incorporated in the polymer and pigment layers to improve the flexibility and mechanical durability of the persistent photoconductive element.
    Type: Grant
    Filed: December 3, 1982
    Date of Patent: April 24, 1984
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Akitaka Yasujima, Sumitaka Nogami, Yoshiharu Kitahama, Isamu Iwami
  • Photoconductive materials comprising nitro or cyano substituted phthalocyanine compounds for electrophotography
    Patent number: 4443528
    Abstract: A photoconductive material comprising a phthalocyanine and a phthalocyanine derivative in which the phthalocyanine molecule has benzene nuclei substituted with at least one member selected from nitro and cyano groups, and an electrophotographic plate comprising a photoconductive layer of the photoconductive material dispersed in a binder resin.
    Type: Grant
    Filed: March 21, 1983
    Date of Patent: April 17, 1984
    Assignee: Toyo Ink Manufacturing Co., Ltd.
    Inventors: Shinichi Tamura, Toshio Seta, Tsuneo Tanaka, Mititika Hikosaka
  • Preparation of encapsulated electrostatographic toner material using gelatin derivative
    Patent number: 4442194
    Abstract: A process for the preparation of an electrostatographic toner material comprising encapsulated toner particles which comprises:dispersing droplets of hydrophobic liquid having an average particle size in the range from about 0.5 to 1,000 microns and containing pressure fixable adhesive core material including colorant into a hydrophilic colloidal solution containing a gelatin derivative which is selected from the group consisting of a carboxylated gelatin, a sulfonylated gelatin, and an isocyanated gelatin;encapsulating the droplets with a polymerization reaction product of an active-hydrogen-containing compound with an acid chloride, a bischloroformate, a sulfonyl chloride, an isocyanate and/or an isothiocyanate; andseparating the encapsulated droplets from the hydrophilic colloidal solution to obtain the dry toner particles.
    Type: Grant
    Filed: July 1, 1982
    Date of Patent: April 10, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takeshi Mikami
  • Photoconductive compositions and elements containing naphthalene bis-dicarboximide compounds
    Patent number: 4442193
    Abstract: Photoconductive compositions comprising photoconductors and 1,4,5,8-naphthalene bis-dicarboximide sensitizing compounds are disclosed. Compositions and elements containing such compounds are sensitized to radiation below 400 nm. Embodiments are disclosed in which the photoconductor is an arylalkane leuco base. Such embodiments are advantageously nonsensitive to radiation above 400 nm and are also nonpersistent.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: April 10, 1984
    Assignee: Eastman Kodak Company
    Inventors: Chin H. Chen, Ralph H. Young, Michael Scozzafava
  • Electrophotographic copying process for producing a plurality of copies
    Patent number: 4442191
    Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively. The photosensitive member may be subjected to steps of imagewise irradiation simultaneously with charging, then inverse charging, then uniform exposure and the like to form a positive or a negative electrostatic latent image. The electrostatic latent image thus formed is repeatedly subjected to a developing and a transfer step to produce a number of copies.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: April 10, 1984
    Assignee: Olympus Optical Company Ltd.
    Inventor: Masaji Nishikawa
  • Disazo compound, method of making same and electrophotographic element using same
    Patent number: 4440845
    Abstract: A disazo compound having the general formula (1) ##STR1## (wherein X represents a substituted or unsubstituted aromatic ring or hetero ring, and Ar represents a substituted or unsubstituted aromatic ring or hetero ring);a method of making said disazo compound which comprises using, as a starting material, couplers having the general formula (2) ##STR2## and the general formula (4) ##STR3## (wherein X and Ar are the same as defined above); and a multilayer type electrophotographic element using said disazo compound as a charge transfer substance.
    Type: Grant
    Filed: June 4, 1982
    Date of Patent: April 3, 1984
    Assignee: Ricoh Co., Ltd.
    Inventor: Mitsuru Hashimoto
  • Electrophotographic copying process for forming positive or negative images
    Patent number: 4440843
    Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: April 3, 1984
    Assignee: Olympus Optical Company Ltd.
    Inventor: Masaji Nishikawa
  • Electrophotographic copying process involving simultaneous charging and imaging
    Patent number: 4440844
    Abstract: An electrophotographic copying process utilizes a photosensitive member for electrophotography which comprises a first and a second photoconductive layer which are sensitive to radiation of a first and a second wavelength region, respectively.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: April 3, 1984
    Assignee: Olympus Optical Company Ltd.
    Inventor: Masaji Nishikawa
  • Method for the production of dry toner for electrostatography using interfacial polycondensation techniques
    Patent number: 4439510
    Abstract: Disclosed is a method of preparing electroscopic marking particles comprising encapsulating an ink using an aqueous phase emulsion solution including an albumin stabilizer which becomes hydrophobic during processing to give relatively dry, non-tacky particles.
    Type: Grant
    Filed: August 10, 1982
    Date of Patent: March 27, 1984
    Assignee: Research Holdings Pty Limited
    Inventor: Arthur R. McLoughlin
  • Elastic detergent product of improved foaming power after use
    Patent number: 4439355
    Abstract: An elastic detergent product of improved form-retaining ability during elevated temperature storage and of improved foaming power after use comprises an organic detergent which is an ammonium or lower alkanolammonium anionic organic detergent salt or a mixture of such anionic detergent with amphoteric synthetic organic detergent, gelatin and a lower di- or polyhydric alcohol. The products made, which are essentially free of water, or anhydrous, and often are of bar, cake or shaped article forms, are of improved thermal stability, allowing them to be stored at higher temperatures than comparable products, without distortion, and do not readily form inhibiting gel structures or coatings after use, which could otherwise diminish foaming power. Also within the invention is a method of making the described detergent products.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: March 27, 1984
    Assignee: Colgate-Palmolive Company
    Inventor: Divaker B. Kenkare
  • Method for transferring and fixing a toner image
    Patent number: 4439462
    Abstract: In the transfer of a toner image from a transfer medium such as a belt to transfer material such as paper, heating and fixing of the toner is required. According to the present invention, two sources of heat are used, one applied to the transfer medium and the other to the paper, the heat applied to the transfer medium being insufficient to melt or fuse the toner, with the heat applied to the paper being greater than necessary for fusing. When the hot paper contacts the underheated transfer medium the temperature of the latter is then and only then increased to the fusing temperature and the transfer and fixing of the toner image upon the paper takes place.
    Type: Grant
    Filed: March 24, 1982
    Date of Patent: March 27, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Noriyoshi Tarumi, Kiyoshi Kimura, Hiroshi Tokunaga, Yukio Okamoto, Makoto Tomono
  • Electrophotographic recording material comprises arsenic, selenium and tellurium
    Patent number: 4439508
    Abstract: An electrophotographic recording material including a photoconductor made of a selenium compound applied as a layer on an electrically conductive substrate. The photoconductor includes a compound of arsenic, selenium and tellurium of the formula As.sub.2 Se.sub.3-x Te.sub.x, where 0<x<3.
    Type: Grant
    Filed: June 3, 1981
    Date of Patent: March 27, 1984
    Assignee: Licentia Patent-Verwaltungs-GmbH
    Inventors: Manfred Lutz, Bernd Reimer
  • Electrophotographic process for the production of lithographic printing plates and light-sensitive materials for use therein
    Patent number: 4435491
    Abstract: A process for the production of lithographic printing plates, and a light-sensitive material for use in the process are described. The light-sensitive material comprises an electrically conductive support having a hydrophilic surface, and a positive type light-sensitive layer and a photoconductive insulative layer on the support, wherein the positive type light-sensitive layer and the photoconductive insulative layer are provided on the support as a unit layer or individually in that order, and the photoconductive insulative layer can be charged either positively or negatively. The desired lithographic printing plate can be prepared by treating the light-sensitive material by the simple process of the invention.
    Type: Grant
    Filed: November 25, 1981
    Date of Patent: March 6, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takashi Kitamura, Hiroshi Kokado