Patents Examined by John L. Goodrow
  • Patent number: 7704659
    Abstract: To provide a toner which has superior low-temperature fixing performance, high-temperature anti-offsetting properties and developing performance and may cause neither melt sticking of toner to photosensitive member nor turn-up of cleaning blade. The toner contains at least a binder resin, a colorant and a wax, and the wax is characterized by i) being an oxidized hydrocarbon wax, ii) having a hydroxyl value of from 5 mgKOH/g or more to 150 mgKOH/g or less, and iii) having, in molecular weight distribution measured by gel permeation chromatography of tetrahydrofuran-soluble matter, a main peak within the range of molecular weight of from 200 or more to 600 or less, and a component with a molecular weight of 700 or more in a content of 3% by mass or less.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: April 27, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yoshihiro Ogawa, Yusuke Hasegawa, Kouji Nishikawa, Miho Okazaki, Takashige Kasuya
  • Patent number: 7704665
    Abstract: A method for developing toner for use in a single component development system, wherein the process includes a) contacting a styrene acrylate polymer binder resin having a weight average molecular weight (Mw) of from about 50 to about 100 Kpse, and a number average molecular weight (Mn) of from about 10 to about 30 Kpse, a wax selected from the group consisting of polypropylene and polyethylene, and at least one colorant to produce a toner blend, b) aggregating the blend by heating at a temperature at or above the glass transition temperature of the styrene acrylate resin to form an aggregated toner core; c) adding a second binder resin to the aggregated toner core to form a shell over said toner core thereby forming a core-shell toner; d) growing said core-shell toner to a desired size; e) coalescing the core-shell toner by heating at a temperature above the glass transition temperature of the second latex; and f) recovering toner particles, wherein the toner particles have an onset glass transition temperat
    Type: Grant
    Filed: September 26, 2007
    Date of Patent: April 27, 2010
    Assignee: Xerox Corporation
    Inventors: Grazyna E Kmiecik-Lawrynowicz, Daniel W Asarese, Maura A Sweeney, Robert D Bayley
  • Patent number: 7695884
    Abstract: An emulsion aggregation toner including a core and a shell wherein the core includes an amorphous polyester, a wax, a crystalline polyester and an optional colorant and wherein the shell includes an amorphous polyester and a wax and is substantially free of crystalline polyester.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: April 13, 2010
    Assignee: Xerox Corporation
    Inventors: Daryl W. Vanbesien, Guerino G. Sacripante, Michael S. Hawkins, Peter J. G. Rehbein
  • Patent number: 7695878
    Abstract: An image forming apparatus including an image bearer; a charging device charging the image bearer; a light irradiating device irradiating the charged image bearer with light to form an electrostatic image; a developing device developing the electrostatic image with a developer including a toner to form a toner image on the image bearer; a transfer device transferring the toner image; and a cleaning device cleaning the image bearer, wherein the volume average particle diameter of the toner is greater than 5.0 ?m and less than 5.5 ?m, the content of toner particles having a particle diameter of not greater than 4.0 ?m is not higher than 20% by number, the ratio of the first shape factor SF-1 to the second shape factor SF-2 is from 1.00 to 1.15, and the content of toner particles having a SF-2 of not less than 115 is not less than 67.8% by number.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: April 13, 2010
    Assignee: Ricoh Company Limited
    Inventors: Takuya Seshita, Toyoshi Sawada, Tomomi Suzuki, Tsuneyasu Nagatomo, Satoshi Kojima
  • Patent number: 7691553
    Abstract: A kneaded material obtained by heating and melt-kneading a toner composition and a water-based medium containing water are put into a container of a granulating apparatus, and heated by a heater while agitating, to disperse the kneaded material into the water-based medium in its softened state. A temperature at which a loss tangent value of the kneaded material reaches a predetermined loss tangent value A, specifically, 0.5 or more and less than 5.0, is inputted to a granulating temperature input section as a setting granulating temperature T1. The heater is then controlled by a control section so that a granulating temperature as a temperature of the water-based medium measured by a thermometer reaches the setting granulating temperature T1 inputted to the input section. Accordingly, the granulating temperature as a temperature of the water-based medium, and thus a temperature of the kneaded material in the water-based medium is adjusted to T1.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: April 6, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Satoru Ariyoshi, Yoshitaka Kawase, Yoritaka Tsubaki
  • Patent number: 7691551
    Abstract: A layer on the reverse side of an imaging member provides excellent crack resistance to the imaging layer(s) on the front side. The crack-deterring backing layer can be a laminated self-adhesive, such as tape, or a coating. Because the crack-deterring backing layer is on the reverse side, it does not affect the electrical properties of the imaging member. Overcoat layers may be used whose function is limited to improved scratch resistance.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: April 6, 2010
    Assignee: Xerox Corporation
    Inventors: Mohamed Ismail Abu-Abed, Johann E. Junginger, Hany Aziz, Greg McGuire
  • Patent number: 7693454
    Abstract: Disclosed is an image forming apparatus composed of a combination of multi-layered electrophotographic photoreceptor wherein an undercoat layer is made of at least fine titanium oxide particles and a binder resin and has a thickness of 3 ?m or less and the fine titanium oxide particles are surface treated with alumina and silica and have a number average primary particle size of 20 nm or less, and exposing means by LED exposure. Thus, an electrophotographic photoreceptor having good balance between dispersibility of titanium oxide and electrical insulation properties is obtained and image fog does not occur under high temperature and high humidity environment and also excellent image quality can be maintained during continuous printing under low temperature and low humidity environment.
    Type: Grant
    Filed: March 13, 2007
    Date of Patent: April 6, 2010
    Assignee: Kyocera Mita Corporation
    Inventors: Jun Azuma, Junichiro Otsubo
  • Patent number: 7687218
    Abstract: The present invention is a method for the preparation of electrostatographic toner including the following steps. A first dispersion is prepared with a solvent, a silicone wax, and a hyperdispersant. The first dispersion is added to an organic solvent containing a polymer material to form an organic phase. The organic phase is dispersed in an aqueous phase containing a particulate stabilizer to form a second dispersion. The second dispersion is homogenized. The organic solvent is evaporated from the second dispersion and the resultant product is recovered, washed and dried. In an alternate method the hyperdispersant is added directly to the organic phase before mixing with the aqueous phase.
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: March 30, 2010
    Assignee: Eastman Kodak Company
    Inventors: Xiqiang Yang, Dinesh Tyagi
  • Patent number: 7687212
    Abstract: A photoconductor that includes for example, a supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and where the photogenerating layer contains at least one charge trapping releaser.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: March 30, 2010
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Patent number: 7682766
    Abstract: In an image forming method in which a toner image, which is visualized via an electrostatic latent image formed on an electrophotographic photoreceptor, employing a developer incorporating toner, is transferred onto a recording material followed by fixing, and any residual toner remaining on the electrophotographic photoreceptor is removed, an image forming method in which an electrophotographic photoreceptor and a toner which satisfy specified requirements are employed and image formation is carried out while feeding a surface energy lowering agent from the developer onto the aforesaid electrophotographic photoreceptor, and an image forming apparatus employing the same.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: March 23, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Shiro Hirano, Junya Onishi
  • Patent number: 7682762
    Abstract: Processes for making photosensitive organic pigments for use in imaging members, specifically processes for making photosensitive phthalocyanine pigments having a specific nanocrystal form. Embodiments include a copper phthalocyanine nanocrystal with good charge generation for use in the formulation of a charge generating layer and narrow particle size distribution.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: March 23, 2010
    Assignee: Xerox Corporation
    Inventors: Daniel V. Levy, Liang-bih Lin, Jin Wu
  • Patent number: 7678522
    Abstract: A toner is provided prepared by a wet granulation method, comprising a binder resin and a colorant, wherein the toner adsorbs ammonia (NH3) in an amount of from 70 to 400 ?mol/m2 per unit of specific surface area and carbon dioxide (CO2) in an amount of not greater than 10 ?mol/m2 per unit of specific surface area.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: March 16, 2010
    Assignee: Ricoh Company Limited
    Inventors: Minoru Nakamura, Chiyoshi Nozaki, Tsuyoshi Nozaki, Atsushi Yamamoto
  • Patent number: 7678520
    Abstract: A method for producing an electrophotographic toner comprising the steps of: (1) mixing a water-insoluble organic solvent, an oil-soluble dye capable of chelating with a metal, a metal compound and water to form an oil-soluble dye dispersion, (2) removing the organic solvent from the oil-soluble dye dispersion to form colored microscopic particles, and (3) adding an emulsion thermoplastic resin to the colored microscopic particles so as to associate the particles with slow coagulation.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: March 16, 2010
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Koji Daifuku, Kaori Ono
  • Patent number: 7670738
    Abstract: A photoconductor comprising a supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and where the photogenerating layer contains a boron containing compound.
    Type: Grant
    Filed: August 31, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Patent number: 7670741
    Abstract: A toner containing a toner particle manufactured by dispersing an organic solvent in which a component comprising a polymer having a portion reactive with an active hydrogen group is dispersed or dissolved in an aqueous medium; and reacting the polymer with a compound having at least one active hydrogen group, where the polymer is prepared by reacting an aliphatic polyol, a polyester resin and a diisocyanate compound and has an isocyanate group on at least one end of the polymer.
    Type: Grant
    Filed: March 16, 2007
    Date of Patent: March 2, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Masahide Yamada, Akinori Saitoh, Masahiro Ohki
  • Patent number: 7670737
    Abstract: A photoconductor that includes a substrate; an undercoat layer thereover comprised of a metal oxide, and an ultraviolet light absorber component; a photogenerating layer; and at least one charge transport layer.
    Type: Grant
    Filed: July 31, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Patent number: 7670740
    Abstract: A photoconductor that includes, for example, a supporting substrate, a photogenerating layer, at least one charge transport layer comprised of at least one charge transport component, and an overcoating layer in contact with and contiguous to the top charge transport layer, and which overcoating is comprised of a polymer, an optional overcoating charge transport component, and needle shaped particles with an aspect ratio of from 2 to about 200.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Daniel V. Levy, Liang-Bih Lin, Lin Ma
  • Patent number: 7670739
    Abstract: A photoconductor that includes a supporting substrate, and an active layer in contact with the substrate, and which layer contains at least one photogenerating pigment, at least one charge transport component, and a mixture of a metal oxide and a chelating agent of a tetrafluorodihydroxyanthraquinone.
    Type: Grant
    Filed: April 30, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventors: Liang-Bih Lin, Daniel V. Levy, Jin Wu, Linda L. Ferrarese
  • Patent number: 7670733
    Abstract: A photoconductor containing an optional supporting substrate, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and wherein the photogenerating layer contains a Type V hydroxygallium phthalocyanine having incorporated therein a silanol.
    Type: Grant
    Filed: April 27, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Francisco J. Lopez, Linda L. Ferrarese, Liang-Bih Lin
  • Patent number: 7670736
    Abstract: A photoconductor containing a first layer, a supporting substrate thereover, a photogenerating layer, and at least one charge transport layer comprised of at least one charge transport component, and wherein the first layer is in contact with the supporting substrate on the reverse side thereof, and which layer contains a semi-penetrating polymer network formed from crosslinking a suitable fluoropolymer, and within which network structure is penetrated with a polycarbonate.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: March 2, 2010
    Assignee: Xerox Corporation
    Inventors: Huoy-Jen Yuh, Robert C U Yu, Yuhua Tong, David M. Skinner