Patents Examined by John D. Welsh
  • Xerographic method for dry sensitization and electroless coating of an insulating surface and a powder for use with the method
    Patent number: 4504529
    Abstract: Disclosed is a method for the xerographic, pattern-wise deposition of a dielectric powder that is sensitized with a metal compound to enable the electroless plating of a pattern formed by said powder.
    Type: Grant
    Filed: June 18, 1982
    Date of Patent: March 12, 1985
    Assignee: A/S Neselco
    Inventors: Gunnar Sorensen, Leo G. Svendsen
  • Electrophotographic process for producing printing plate and plate making machine
    Patent number: 4500618
    Abstract: A process for producing a printing plate and a printing plate making machine are disclosed. The process involves providing an electrophotographic plate making material which includes a base having a low conductive layer thereon. The material is electrically charged and imagewise exposed. The imagewise exposed material is subjected to liquid toner development with a toner containing a solvent. The solvent is then substantially removed by heating the material to a temperature sufficient to cause the evaporation of the solvent. The material is then moved to a substantially isolated fixing area and again heated in order to fix a toner image on the plate making material. The process can be quickly and easily carried out and eliminates the danger of the explosion of solvent vapors.
    Type: Grant
    Filed: June 28, 1983
    Date of Patent: February 19, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Keisuke Shiba, Hiromi Yazawa, Chikashi Ohishi, Sho Nakao
  • Method of developing an electrostatic latent image uses magnetic developer
    Patent number: 4499166
    Abstract: A developer mixture used in an electrophotographic printing machine to develop an electrostatic latent image recorded on the photoconductive member includes weakly magnetically attractable toner particles and strongly magnetically attractable carrier granules adhering triboelectrically to one another. The toner particles and carrier granules are substantially the same size. During development, the toner particles are deposited on the latent image forming a toner powder image. Subsequently, the toner powder image is transferred to a copy sheet and permanently fixed thereto.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: February 12, 1985
    Assignee: Rank Xerox, Ltd.
    Inventor: Yoshikazu Okamoto
  • Power-transmission method uses spirocyclic ketals
    Patent number: 4499000
    Abstract: Certain spirocyclic ketals of the formula ##STR1## in which R.sup.1 in the case where R.sup.2 denotes hydrogen, represents a cyclohexyl radical optionally substituted by lower alkyl, lower alkoxy and/or cycloalkyl with 5 to 7 carbon atoms, or in whichR.sup.1 and R.sup.2 are linked through 4 methylene groups, which are optionally substituted by lower alkyl, lower alkoxy and/or cycloalkyl with 5 to 7 carbon atoms and form a further acyclic ring.R.sup.3, R.sup.4 and R.sup.5 are identical or different and denote hydrogen, lower alkyl, lower alkoxy or cycloalkyl with 5 to 7 carbon atoms, andZ denotes alkylene with 2 to 4 carbon atoms which is optionally substituted by lower alkyl and/or cycloalkyl with 5 to 7 carbon atoms,are disclosed together with their use in power transmission fluids.
    Type: Grant
    Filed: February 18, 1983
    Date of Patent: February 12, 1985
    Assignee: Bayer Aktiengesellschaft
    Inventors: Karl-Heinz Hentschel, Rolf Dhein, Hans Winter, Herbert Vojacek
  • Pressure-fixable microcapsule toner
    Patent number: 4497885
    Abstract: A microcapsule toner for pressure fixing, comprising a core material containing a pressure-fixable component and a magnetic material, a first shell layer comprising a formaldehyde copolymer resin and a second shell layer comprising a polymer soluble in an organic solvent provided successively by coating therearound. This microcapsule, since a pressure-fixable core material is successively coated with a lipophobic first shell layer and a lipophilic second shell layer, has well-balanced pressure fixing characteristic and developing characteristic without core material exposed on the surface.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: February 5, 1985
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hisayuki Ushiyama, Ichiro Ohsaki, Masanori Takenouchi, Toshiaki Nakahara
  • Two-component dry electrostatic developer composition containing onium charge control agent
    Patent number: 4496643
    Abstract: A two-component, dry electrostatic developer composition containing toner particles and coated-carrier particles is disclosed. The toner contains a binder polymer and a phosphonium, arsonium or stibonium charge-control agent dispersed in the toner binder. The carrier is coated with a fluoropolymer. The resulting developer exhibits reduced toner throw-off and other disclosed advantages.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: January 29, 1985
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Lawrence P. DeMejo, Thomas A. Jadwin, Stewart H. Merrill
  • Method of manufacturing a colour television display tube and tube manufactured according to this method
    Patent number: 4496641
    Abstract: A method of making a colour display screen for a television display tube is disclosed. On the window portion of the tube an electron-absorbing layer is provided which is scanned by means of an electron beam via the shadow mask. The charge image on the layer is then developed xerographically. The layer is preferably photoconductive so as to be able to remove the charge remaining after the development by means of a uniform exposure.
    Type: Grant
    Filed: January 18, 1983
    Date of Patent: January 29, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Jacob Van Den Berg, Johannes G. Van Lent, Francis B. Strik
  • Electrophotographic process using transfer-type one-component magnetic developer
    Patent number: 4495268
    Abstract: Disclosed is a transfer-type one-component dry magnetic developer which comprises a binder medium having a high electric resistance and particles of triiron tetroxide of an isometric system having a particle size of 0.25 to 1 micron and a coercive force of 30 to 80 Oe, in which the triiron tetroxide particles are dispersed in the binder medium.This developer provides a transferred image excellent in the density, sharpness and clarity on a plain paper as a transfer sheet in the electrostatic photography.
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: January 22, 1985
    Assignee: Mita Industrial Co., Ltd.
    Inventor: Nobuhiro Miyakawa
  • Electrophotographic photosensitive member comprising disazo compound
    Patent number: 4495264
    Abstract: An electrophotographic photosensitive member and use thereof, having a photosensitive layer upon or over an electrically conductive substrate, the photosensitive layer comprising an organic photoconductive material selected from the group consisting of the following general formula (1), (2), or (3): ##STR1## wherein A represents a coupler component having aromaticity, ##STR2## wherein, A represents a coupler component having aromaticity, R represents hydrogen, halogen, alkyl, or alkoxy, and n represents an integer of 1 to 4, ##STR3## wherein, A represents a coupler component having aromaticity and R.sub.1 represents a single bond or a substituted or unsubstituted divalent hydrocarbon or heterocyclic residue.
    Type: Grant
    Filed: March 14, 1984
    Date of Patent: January 22, 1985
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hideyuki Takahashi, Shozo Ishikawa
  • Photosensitive member for electrophotography comprises inorganic layers
    Patent number: 4495262
    Abstract: Disclosed is a photosensitive member, or an electrophotographic photosensitive member, characterised by having a photoconductive layer comprising at least one of an amorphous hydrogenated and/or fluorinated silicon germanium and an amorphous hydrogenated and/or fluorinated silicon germanium carbide, a first amorphous hydrogenated and/or fluorinated silicon carbide layer formed on the photoconductive layer and a second amorphous hydrogenated and/or fluorinated silicon carbide layer formed beneath said photoconductive layer.
    Type: Grant
    Filed: April 28, 1983
    Date of Patent: January 22, 1985
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Masatoshi Matsuzaki, Toshinori Yamazaki, Isao Myokan, Tetsuo Shima, Hiroyuki Nomori
  • Electrophotographic toner compositions containing novel imide charge control _additives
    Patent number: 4493883
    Abstract: Disclosed are positively charged toner compositions comprised of resin particles, pigment particles, and imide charge enhancing additives of the formula: ##STR1## wherein R.sub.1, R.sub.2, and R.sub.3, are alkyl groups containing from 1 carbon atom to about 25 carbon atoms, R.sub.4 is selected from the group consisting of hydrogen, nitro, halogen, amino, and alkyl and A is an anion.
    Type: Grant
    Filed: February 21, 1984
    Date of Patent: January 15, 1985
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, Doretta Agostine, Paul C. Julien, Raymond A. Yourd, III
  • Electrostatographic system development modulation
    Patent number: 4491408
    Abstract: An electrostatographic imaging system comprising an insulating layer having an imaging surface, a conductive substrate for the insulating layer, means to form an electrostatic latent image on the imaging surface, means to form a toner image on the imaging surface in conformance to the electrostatic latent image and means to supply a variable direct current voltage to the conductive substrate. The electrostatographic imaging system may include an electrically conductive member parallel to and spaced from the imaging surface and a means to supply a variable electrical bias to the electrically conductive member in response to a change in the value of direct current voltage supplied to the conductive substrate.
    Type: Grant
    Filed: January 3, 1984
    Date of Patent: January 1, 1985
    Assignee: Xerox Corporation
    Inventor: Edward C. Savage
  • Multilayer electrophotographic recording material comprises a selenium-tellurium first layer and selenium-arsenic containing second layer
    Patent number: 4490451
    Abstract: The recording material comprises a metallic base, for example, of aluminum, a twenty to sixty .mu.m thick layer of selenium with a content of tellurium ranging between 5 and 30 percent by wt. and a layer of selenium having a thickness ranging between 0.5 and 3 .mu.m arranged thereon containing 0.5 to 5 percent by wt. of arsenic. Instead of the layer of selenium containing arsenic, there may also be provided a layer of arsenic-triselenside. Preferably, the content of tellurium in the selenium layer containing tellurium, increases either step-by-step or continuously from the metallic base up to the layer of selenium containing arsenic. The electrophotographic recording material has a sensitivity within the region from 600 to 850 nanometers, the surface is stabilized against corona effects, and the material has a good residual potential behavior.
    Type: Grant
    Filed: June 7, 1983
    Date of Patent: December 25, 1984
    Assignee: International Standard Electric Corporation
    Inventors: Armin Baumgaertner, Kurt Elsaesser
  • Conductive single component electrophotographic magnetic toner
    Patent number: 4487825
    Abstract: This invention relates to a conductive single component magnetic dry toner comprised of resins selected from polystyrene allyl alcohol copolymers, and epoxy resins, a magnetic material such as magnetite, and a conductive carbon black which is adhered and/or embedded on the surface of the copolymer or epoxy resin-magnetic material mixture. Such toner compositions, which have excellent conductivity, superior flow properties and low melt fusing temperatures, 95.degree. C.-130.degree. C., are useful for causing the development of images in commercial printers and recorders such as the Versatec printers.
    Type: Grant
    Filed: January 22, 1981
    Date of Patent: December 11, 1984
    Assignee: Xerox Corporation
    Inventors: Robert J. Gruber, John F. Knapp
  • Magnetic toner particles coated with opaque polymer particles to obscure color thereof
    Patent number: 4486523
    Abstract: The present invention relates to magnetic toners and processes for producing them. The toner materials that are produced have the color of the magnetic material substantially obscured while still maintaining the high percentages of magnetic materials necessary for many types of magnetic printing processes. Further, the toners may be provided with a desired shade or color with dyes or pigments. The process of production preferably involves the coating of the individual magnetic particles with low-density essentially opaque polymeric particulate material having an affinity for the magnetic particles, thereby obscuring the color of said magnetic particles. The resulting coated particles may be intermixed with dyes, pigments, binders and other material as desired to produce toners which are useful for a variety of purposes, including multi-color reproduction techniques.
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: December 4, 1984
    Assignee: Armstrong World Industries, Inc.
    Inventors: Lewis K. Hosfeld, Ronald S. Lenox
  • Toner for developing electrostatic latent images comprising a resin having specified molecular weight parameters
    Patent number: 4486524
    Abstract: The present application relates to a novel toner for developing electrostatic latent images. The toner contains a colorant and a resin wherein the resin contains at least one particular type of polymer which has a Mw/Mn ratio of from 3.5 to 40 wherein the Mn value is about between 2,000 and 30,000.
    Type: Grant
    Filed: November 13, 1981
    Date of Patent: December 4, 1984
    Assignee: Konishiroku Photo Industry Co., Ltd.
    Inventors: Yasuyuki Fujisaki, Minoru Takahashi, Hiroshi Ogawara, Hirozo Funaki, Ryubun Seimaya, Yutaka Yamada, Makoto Tomono, Noriyoshi Tarumi
  • Photoconductive devices containing novel squaraine compositions
    Patent number: 4486520
    Abstract: This invention is generally directed to fluorinated squaraine compositions of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, are independently selected from alkyl groups, containing from about 1 to about 20 carbon atoms, and layered photoresponsive devices containing such compositions.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: December 4, 1984
    Assignee: Xerox Corporation
    Inventor: John F. Yanus
  • Laminate type electrophotographic light-sensitive material
    Patent number: 4485159
    Abstract: In an electrophotographic light-sensitive material comprising at least one electric charge generation layer comprising a charge generating substance and a binder resin therefor and at least one electric charge transport layer on an electrically conductive base, said electrophotographic light-sensitive material is a laminate type electrophotographic light-sensitive material wherein the binder resin for the electric charge generating substance contains at least one polyvinylpyridine resin.
    Type: Grant
    Filed: October 23, 1980
    Date of Patent: November 27, 1984
    Assignee: Copyer Co., Ltd., Canon Inc.
    Inventors: Katsunori Watanabe, Shigeto Ohta, Kiyoshi Sakai, Shozo Ishikawa, Makoto Kitahara
  • One-component magnetic dry developer comprises triiron tetroxide having specified coercive force and vinyl aromatic polymer and process of use
    Patent number: 4485163
    Abstract: A one-component magnetic dry developer for use in development of positively charged images and transfer of developed images, comprises particles of a composition comprising a vinyl aromatic polymer, an aliphatic carboxylic acid having at least 14 carbon atoms, inclusive of the carbon atom of the carboxyl group, per carboxyl group or its metal salt and a finely divided magnetic material having a coercive force not larger than 120 Oe and a bulk density of at least 0.45 g/ml.This magnetic developer provides an excellent transferred image having high image density and image sharpness on a plain paper as a transfer sheet without fogging or broadening of the contour of the image.
    Type: Grant
    Filed: June 2, 1982
    Date of Patent: November 27, 1984
    Assignee: Mita Industrial Company Limited
    Inventor: Nobuhiro Miyakawa
  • Method of cleaning a transfer material supporting member in an image forming apparatus
    Patent number: 4483610
    Abstract: The present invention relates to the drive and control of a device for cleaning transfer material supporting member, the cleaning device being adapted to operate only when corona dischargers disposed opposite the transfer material supporting member are not in operation, whereby toner particles scattered upon the operation of the cleaning device is prevented from depositing on the surrounding parts under the influence of corona discharging.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: November 20, 1984
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yusaku Takada