Patents Examined by John L. Goodrow
  • Patent number: 7745082
    Abstract: A photoreceptor drum is disclosed with a charge transport layer comprising a substituted terphenyl diamine having the structure of Formula (I): wherein R1 and R2 are independently selected from the group consisting of hydrogen, alkyl having from 1 to 10 carbon atoms, halogen, and phenyl; and wherein at least one of R1 and R2 is not hydrogen.
    Type: Grant
    Filed: August 9, 2007
    Date of Patent: June 29, 2010
    Assignee: Xerox Corporation
    Inventors: Nancy L. Belknap, John F. Yanus, Dale S. Renfer, Anthony M. Horgan, Kendra M. Giza
  • Patent number: 7736831
    Abstract: A process for preparing a toner includes mixing a polymeric resin emulsion, a colorant dispersion, and a wax to form a mixture; optionally adding a coagulant to the mixture; heating the mixture at a temperature below a glass transition temperature of the polymeric resin to aggregate the polymeric resin, colorant, and wax, to form aggregated particles; adding a coalescent agent to the aggregated particles; heating the aggregated particles and coalescent agent at a temperature above the glass transition temperature of the polymeric resin, to coalesce the aggregated particles to form toner particles, optionally cooling the mixture, and isolating the tone particles.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: June 15, 2010
    Assignee: Xerox Corporation
    Inventors: Zhen Lai, Richard Fong, Yuhua Tong, Chieh-Min Cheng, Amy A. Grillo, Paul F. Smith, Paul J. Gerroir, Beng S. Ong
  • Patent number: 7732116
    Abstract: The present invention is an electrophotographic photoconductor having a photosensitive layer on a conductive substrate. The photosensitive layer contains N-arylphthalimides additives.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: June 8, 2010
    Assignee: Eastman Kodak Company
    Inventors: David S. Weiss, William T. Gruenbaum, John C. Wilson
  • Patent number: 7732112
    Abstract: An imaging member includes a substrate; a charge generation layer positioned on the substrate; at least one charge transport layer positioned on the charge generation layer; and an undercoat layer positioned on the substrate on a side opposite the charge generation layer, the undercoat layer comprising a binder component and a metallic component comprising metal thiocyanate and metal oxide.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: June 8, 2010
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Daniel V. Levy, Liang-bih Lin
  • Patent number: 7732114
    Abstract: Modified nigrosine which has satisfactory dispersibility in resin and which reduces the residual aniline amount is offered, and its production method is also offered. Moreover, toner for developing electrostatic charge images is offered, which uses modified nigrosine colorant that resolves the aforementioned problems, which has excellent charge-imparting properties, which exhibits no fogging, which experiences no scattering of toner inside the developing apparatus, and which has little fluctuation of image density. Modified nigrosine, which is nigrosine (b) that has been modified by rosin-modified resin (a) with an acid value of 110 or less.
    Type: Grant
    Filed: September 21, 2005
    Date of Patent: June 8, 2010
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Shinji Amaya, Toshiro Kogawara
  • Patent number: 7727698
    Abstract: Disclosed is an image forming method comprising developing a latent electrostatic image formed on the surface of a latent electrostatic image bearing body by a developer borne and conveyed by a developer bearing body which is brought into contact with a developer layer control member to control an amount of the developer on the surface of the developer bearing body through a nonmagnetic single-component development system, wherein an acid value (SAV) of the surface of the developer and a total acid value (TAV) of the developer meet the following requirements: 1<SAV/TAV?5 and 5?TAV?25, and a ratio of a mass average particle size (d50, ?m) of the developer to a surface roughness (Ra, ?m), d50/Ra being in a range of 0.5 to 3.0 and an average spacing (Sm) between protruding peaks of the developer bearing body being in a range of 20 to 200 ?m.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: June 1, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Eiichi Yoshida, Masahiko Nakamura, Masahiro Anno, Kaori Soeda, Tomoko Mine, Kenichi Onaka
  • Patent number: 7727692
    Abstract: An electrophotographic photoreceptor comprises: an electroconductive support; and a photosensitive layer on the electroconductive support, wherein the photosensitive layer comprises a functional layer, the functional layer comprising: a compound having a triple bond and a hydroxyl group in a molecule; and a cured product of a curable resin.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: June 1, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Wataru Yamada, Katsumi Nukada
  • Patent number: 7727697
    Abstract: An electrophotographic toner is disclosed, meeting the requirement that a ratio of a storage modulus at 60° C. [G?(60)] to a storage modulus at 80° C. [G?(80)], G?(60)/G?(80) is from 1×102 to 1×104; a ratio of a storage modulus at 100° C. [G?(100)] to a storage modulus at 120° C. [G?(120)], G?(100)/G?(120) is from 1 to 10; and a storage modulus at a temperature of from 140 to 160° C., [G?(140-160)] is not less than 102 dyn/cm2.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: June 1, 2010
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Shiro Hirano, Shingo Fujimoto, Takao Yamanouchi, Hirofumi Koga, Masaaki Kondo, Junya Onishi
  • Patent number: 7727699
    Abstract: The present invention relates to a process for producing a toner for electrophotography, including: (a) a step of aggregating resin particles containing a resin binder in an aqueous medium; and (b) a step of unifying the aggregated resin particles, the step (a) including: (a-1) a step of adding a monovalent salt as an aggregating agent; and (a-2) a step of adding at least one compound selected from the group consisting of alkylethersulfates represented by the formula (1): R—O—(CH2CH2O)nSO3M??(1) wherein R is an alkyl group; n represents an average molar number of addition and is a number of more than 0 and not more than 15 (0<n?15), and M is a monovalent cation, alkylsulfates and linear alkylbenzenesulfonates. The toner of the present invention has a small particle size which is controlled with a high accuracy, and a sharp particle size distribution, and a particle shape of the toner is readily controlled even at a low temperature, and further the obtained toner exhibits a high circularity.
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: June 1, 2010
    Assignee: Kao Corporation
    Inventors: Nobumichi Kamiyoshi, Manabu Suzuki, Yutaka Murai
  • Patent number: 7727694
    Abstract: A toner including toner particles including a binder resin, and a colorant, and an external additive present on a surface of the toner particles, wherein the external additive includes a silica having an average primary particle diameter of from 100 to 500 nm and a BET specific surface area of from 800 to 1000 m2/g. An image forming method including forming an electrostatic image on an image bearing member; developing the electrostatic image with the toner to form a toner image; and transferring the toner image on to a receiving material. An image forming apparatus including an image bearing member bearing an electrostatic image; a developing device developing an electrostatic image with the toner to form a toner image on the image bearing member; a transfer device transferring the toner image to a receiving material; and a fixing device fixing the toner image on the receiving material.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: June 1, 2010
    Assignee: Ricoh Company Limited
    Inventors: Hiroyuki Murakami, Masahide Inoue, Masayuki Hagi, Takuya Kadota, Yoshihiro Mikuriya, Hideaki Yasunaga, Hiroaki Katoh, Yoshimichi Ishikawa, Kazuoki Fuwa
  • Patent number: 7723001
    Abstract: An electrophotographic toner includes toner parent particles containing a binder resin, a colorant and a charge control agent; and an external additive added to the surface of the toner parent particles. The toner further includes positively chargeable silica and polymer beads in addition to large particle diameter silica, small particle diameter silica and titanium oxides. Thus, the toner can maintain its charge quantity and distribution stably even during environmental changes and after long image printing times, thereby preventing the contamination of the non-image part and the filming.
    Type: Grant
    Filed: July 23, 2007
    Date of Patent: May 25, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Sang-woo Kim
  • Patent number: 7722711
    Abstract: An image-forming recording liquid according to the invention contains magnetic polymer particles and a dispersion medium for dispersing the magnetic polymer particles. The magnetic polymer particles contain a magnetic powder and a polymeric compound. The polymeric compound is a polymer prepared by polymerization of at least one monomer selected from the group consisting of a (meth)acrylate monomer and a styrenic monomer. The dispersion medium contains water, polyvinyl alcohol and an acetylene glycol-based surfactant.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: May 25, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takako Kobayashi, Yoshihiro Inaba
  • Patent number: 7718340
    Abstract: To provide an image forming apparatus, image forming method and process cartridge, which are excellent in low-temperature fixation properties, storage stability, durability and filming resistance, can reduce generation of odor, and are capable of forming an extremely high quality image. The apparatus includes: a latent electrostatic image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a fixing unit; wherein the toner comprises a binder resin and coloring agent, and the binder resin comprises a polyester-based resin (A) and polyester-based resin (B) having a melting point at least 10° C. higher than that of the polyester-based resin (A), and at least one of the polyester-based resins (A) and (B) is a resin derived from a (meth)acrylic acid modified rosin and includes a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid modified rosin.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: May 18, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuaki Iwamoto, Yohichiroh Watanabe, Yasutada Shitara
  • Patent number: 7713671
    Abstract: A toner, which is semispherical and has plural dents on the surface, including a binder resin; and a pigment, wherein a circle circumscribing a circular profile of the toner provides an average envelopability (AE) of 10 to 10,000 particles thereof of from 74 to 84%, which is measured by the following formula: AE(%)=(AC?AD)/AC×100 wherein AC is an area of the circle and AD is a total sum of areas of the dents.
    Type: Grant
    Filed: July 12, 2007
    Date of Patent: May 11, 2010
    Assignee: Ricoh Company Limited
    Inventor: Yukio Tabata
  • Patent number: 7713672
    Abstract: To provide an image forming apparatus including a latent electrostatic image bearing member; a charging unit; an exposing unit; a developing unit; a transferring unit; and a fixing unit, wherein the binder resin of a toner comprises a polyester-based resin (A) and a polyester-based resin (B) having a melting point which is at least 10° C. higher than that of the polyester-based resin (A), the polyester-based resins (A) is a resin which is derived from a (meth)acrylic acid-modified rosin and which has a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid-modified rosin, and the polyester-based resin (B) is a resin derived from a fumaric acid/maleic acid-modified rosin and has a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing any one of a fumaric acid-modified rosin and a maleic acid-modified rosin.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: May 11, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Yohichiroh Watanabe, Yasuaki Iwamoto, Yasutada Shitara
  • Patent number: 7709171
    Abstract: The present invention provides a charge control agent, adapted to control charging ability of resins or compositions containing resins, comprising a copolymer that comprises a polymer block A and a polymer block B, the polymer block A is prepared by copolymerizing a maleimide, which being unsubstituted or substituted for a hydrogen atom of an imide group by an electron-donating group, and styrene or a styrene derivative, and the polymer block B is formed of a polymer of styrene or a styrene derivative.
    Type: Grant
    Filed: July 18, 2007
    Date of Patent: May 4, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Atsushi Yamamoto, Chiyoshi Nozaki, Tsuyoshi Nozaki, Mitsuyo Matsumoto, Katsunori Kurose
  • Patent number: 7709169
    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 wherein the at least one charge transport layer contains at least one charge trapping releaser.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: May 4, 2010
    Assignee: Xerox Corporation
    Inventor: Jin Wu
  • Patent number: 7709168
    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 wherein the at least one charge transport layer contains at least one phosphonium salt.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: May 4, 2010
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Edward F Grabowski, Kent J Evans, Daniel V Levy
  • Patent number: 7704662
    Abstract: A toner for use in a single component development system, said toner including emulsion aggregation toner particles with a styrene acrylate polymer binder resin having a 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, wherein the toner particles have an onset glass transition temperature of from about 50° C. to about 60° C., and a circularity of from about 0.950 to about 0.990.
    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: 7704663
    Abstract: An image forming method comprises: supplying an image support onto an imaging site, the image support comprising a substrate, a light-scattering layer containing a white pigment and a first thermoplastic resin comprising a polyolefin-based resin, and a toner-receiving layer containing a second thermoplastic resin comprising a mixture of a crystalline resin and an amorphous resin, in this order, forming a colored toner image on the image support with a colored toner containing a third thermoplastic resin; and forming a transparent toner image on the image support having the colored toner image formed thereon with a transparent toner containing a fourth thermoplastic resin having a glass transition temperature of from not lower than about 50° C. to lower than about 70° C.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: April 27, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Osamu Ide