Patents Examined by John L. Goodrow
  • Patent number: 7662526
    Abstract: A photoconductor containing a supporting substrate, a photogenerating layer, and at least one charge transport layer of at least one charge transport component, and wherein the charge transport layer contains a charge blocking agent, such as a benzoimidazole.
    Type: Grant
    Filed: May 4, 2007
    Date of Patent: February 16, 2010
    Assignee: Xerox Corporation
    Inventors: Liang-Bih Lin, Daniel V. Levy, Jin Wu, Marc J. Livecchi
  • Patent number: 7662536
    Abstract: A resin particle liquid dispersion for an electrostatic image developing toner includes: a polycondensable resin obtained by polycondensing at least one selected from the group consisting of a polycondensable monomer, an oligomer of the polycondensable monomer and a prepolymer of the polycondensable monomer, wherein the resin particle liquid dispersion further comprises a compound having a solubility parameter of 8 or less.
    Type: Grant
    Filed: November 3, 2006
    Date of Patent: February 16, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Hirotaka Matsuoka, Hideo Maehata, Satoshi Hiraoka, Yuki Sasaki, Fumiaki Mera
  • Patent number: 7662532
    Abstract: An image forming method including forming an image of a toner on a receiving material; and fixing the toner image on the receiving upon application of heat and pressure thereto, wherein the weight average particle diameter (D4) of the toner is from 2.0 to 4.5 ?m, the pressure (P) is not greater than 15 N/cm2, P×D4 is not less than 30 N/cm2·?m, the melt viscosity (Gw110) of the toner at 110° C. is from 3,000 to 40,000 Pa·s, the melt viscosity (Gw140) of the toner at 140° C. is from 100 to 1,000 Pa·s, and the ratio Gw110/Gw140 is not less than 30.
    Type: Grant
    Filed: March 7, 2007
    Date of Patent: February 16, 2010
    Assignee: Ricoh Company Limited
    Inventor: Masami Tomita
  • Patent number: 7662525
    Abstract: A photoconductor that contains 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 first layer includes a polymer and needle shaped particles with an aspect ratio of from 2 to about 200.
    Type: Grant
    Filed: March 29, 2007
    Date of Patent: February 16, 2010
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Daniel V. Levy, Liang-Bih Lin, Lin Ma, Ryan J. Ehmann
  • Patent number: 7659045
    Abstract: Resin particles containing at least binding resin and wax particles having a diameter of 30 to 600 nm are coagulated, and a resulting coagulated product is heated. Such wax particles are manufactured, for example, by way of a coarse particle preparing step, a slurry preparing step, a pulverizing step, a cooling step, and a depressurizing step. Slurry of wax coarse particles obtained by way of the coarse particle preparing step and the slurry preparing step is directed under heat and pressure through a pressure-resistant nozzle whereby the wax coarse particles are pulverized into the wax particles at the pulverizing step. The cooling step and the depressurizing step are disposed just after the pulverizing step to prevent the wax particles from coarsening.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: February 9, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yasuhiro Shibai, Satoru Ariyoshi, Katsuru Matsumoto
  • Patent number: 7655374
    Abstract: A fixing liquid configured to fix a toner containing a resin on a recording medium is disclosed, wherein a particle containing a component capable of dissolving or swelling at least one portion of the resin contained in the toner is dispersed in a nonaqueous dispersing medium. A toner fixing method of fixing a toner containing a resin on a recording medium is disclosed, wherein the fixing liquid as described above is used. A toner fixing apparatus configured to fix a toner containing a resin on a recording medium is disclosed, wherein the toner fixing method as described above is used.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: February 2, 2010
    Assignee: Ricoh Company, Ltd.
    Inventors: Yasuo Katano, Tsuneo Kurotori, Hiromichi Komai, Takuma Nakamura, Tomoyasu Hirasawa
  • Patent number: 7648810
    Abstract: An electrophotographic imaging member comprises a substrate, an electrophotographic imaging layer and an overcoat layer comprising a cross-linkable polymer and a hole transport material, wherein the overcoat layer provides at least one of solvent resistance and hydrocarbon resistance to the electrophotographic imaging layer.
    Type: Grant
    Filed: September 14, 2006
    Date of Patent: January 19, 2010
    Assignee: Xerox Corporation
    Inventors: John F. Yanus, Kenny-Tuan T. Dinh, Dale S. Renfer, Nancy L. Belknap, Anthony M. Horgan
  • Patent number: 7645548
    Abstract: A coating composition having a polymer resin composition containing at lest an acid catalyst and a masking agent, wherein the masking agent is selected from the group consisting of compound A, compound B, and the acylated derivatives of compound A, where compound A is given by the structural formula (I): where X represents a substituent selected from the group consisting of —OR and —NR?R?, wherein R, R?, and R? each independently represent a hydrogen atom or a hydrocarbyl group; and compound B is given by the structural formula (II): where Y and Z independently represent —OH or —NH2.
    Type: Grant
    Filed: November 6, 2006
    Date of Patent: January 12, 2010
    Assignee: Xerox Corporation
    Inventors: Kathy L. De Jong, Hany Aziz, Nan-Xing Hu
  • Patent number: 7645551
    Abstract: Disclosed herein are toner particles generated by emulsion/aggregation processes. The processes are conducted under conditions that shorten the time for coalescence and post-formation washing, thereby increasing efficiency of the processes as compared to conventional processes.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: January 12, 2010
    Assignee: Xerox Corporation
    Inventors: Amgad W. Sifain, Emily L. Moore, Anthony Uttaro, Jr., Peter V. Nguyen, Jon T. Owens, Ryan Accetta, Karen A. Moffat, Vladislav Skorokhod, Cuong Vong, Wafa F. Bashir, Richard P. N. Veregin, Shigang S. Qiu
  • Patent number: 7642026
    Abstract: The invention provides an electrophotographic photoreceptor that includes a cylindrical support, and a charge-generating layer and a charge-transporting layer on the cylindrical support, wherein a content per unit volume of a charge-generating material in the charge-generating layer increases from a center portion in an axial direction of the cylindrical support towards both end portions thereof, and a thickness of the charge-generating layer in an axial direction of the cylindrical support is 95% or more and 105% or less relative to an average thickness of the charge-generating layer.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: January 5, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazuyuki Tada, Tomotake Inagaki, Masaru Agatsuma, Tomomasa Sato
  • Patent number: 7642025
    Abstract: The invention provides an electrophotographic photoreceptor having a cylindrical support, and a charge-generating layer and a charge-transporting layer on or above the cylindrical support, wherein the thickness of the charge-generating layer is increased from the central portion in the axial direction of the cylindrical support towards both end portions thereof, and the difference in thickness between the two end portions is 2.5% or less of an average thickness of the charge-generating layer. Also disclosed are a method of producing the electrophotographic photoreceptor, a process cartridge including the electrophotographic photoreceptor, and an image-forming apparatus.
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: January 5, 2010
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kazuyuki Tada, Masaru Agatsuma, Tomotake Inagaki, Tomomasa Sato, Toru Asahi, Naoki Morita, Kenji Ikeda
  • Patent number: 7638250
    Abstract: A toner is provided including a colorant; a binder resin (A) which is a polyester resin having no tetrahydrofuran insoluble component, and having a molecular weight distribution such that components having a molecular weight of not greater than 500 are included in an amount of not greater than 4% by weight and a peak is present in a molecular weight range of from 3,000 to 9,000 when measured by gel permeation chromatography (GPC); and a binder resin (B) which is a polyester resin having no tetrahydrofuran insoluble component, and including units of a polycarboxylic acid and a diol having the specific formula; wherein at least one of the binder resins (A) and (B) is prepared in the presence of the specific titanium-containing catalyst, and wherein a weight ratio ((A)/(B)) of the binder resin (A) to the binder resin (B) is from 60/40 to 85/15.
    Type: Grant
    Filed: March 14, 2007
    Date of Patent: December 29, 2009
    Assignee: Ricoh Company Limited
    Inventors: Takahiro Honda, Hiroyuki Fushimi, Osamu Uchinokura
  • Patent number: 7638251
    Abstract: The invention provides a toner which is excellent in its low-temperature fixing property and high-temperature offset resistance regardless of the types of paper, and constantly provides high-quality images regardless of environments and does not generate image defects even after prolonged use. In a master curve of the toner at a reference temperature of 150° C., a difference between a storage modulus at a frequency of 0.1 Hz and a storage modulus at a frequency of 1000 Hz is set in a rage from 0 to 2.5×105 Pa, where the activation energy determined from a shift factor is brought to a range from 50 to 130 kJ/mol.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: December 29, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Katsuhisa Yamazaki, Shuichi Hiroko, Shuhei Moribe
  • Patent number: 7629098
    Abstract: A method of producing a toner for developing electrostatic charge image, the method comprising: aggregating particles containing a crystalline polyester resin, particles containing a non-crystalline polyester resin and particles of a releasing agent in an aqueous medium, so as to form aggregated particles; and heating the aggregated particles to fuse into a coalescent body, wherein at least one of the crystalline polyester resin and the non-crystalline polyester resin is obtained by polymerization at temperatures not higher than 150° C. with a Bronsted acid containing a sulfur atom as a catalyst, and wherein a first onset temperature A(° C.) of the toner and a glass transition temperature B(° C.) of the non-crystalline polyester resin as measured by differential scanning calorimeter satisfy a relation (B?A)?10, and wherein a weight average molecular weight of the crystalline polyester resin is ½ or lower of a weight average molecular weight of the non-crystalline polyester resin.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: December 8, 2009
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Hirotaka Matsuoka, Satoshi Hiraoka, Yuki Sasaki, Fumiaki Mera, Hideo Maehata
  • Patent number: 7622230
    Abstract: A photoconductor containing a substrate, an undercoat layer thereover wherein the undercoat layer includes, for example, a polyol resin, an aminoplast resin, a polymeric phosphate ester adhesion component, and a metal oxide; and at least one imaging layer, such as a photogenerating and charge transport layer, formed on the undercoat layer.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: November 24, 2009
    Assignee: Xerox Corporation
    Inventors: Daniel V. Levy, Jin Wu, Liang-Bih Lin, Francisco J. Lopez
  • Patent number: 7622238
    Abstract: A process for producing an electrophotographic photosensitive member, which has the step of bringing i) the surface of an electrophotographic photosensitive member having at least a charge transport layer on a cylindrical support and ii) a mold having a fine unevenness surface profile into pressure contact with each other to transfer the fine unevenness surface profile to the surface of the electrophotographic photosensitive member. The mold and the support are so temperature-controlled as to be T3<T1<T2 where the glass transition temperature of the charge transport layer is represented by T1 (°C.), the temperature of the mold by T2 (°C.), and the temperature of the support by T3 (°C.).
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: November 24, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroki Uematsu, Akira Shimada, Masataka Kawahara, Harunobu Ogaki, Atsushi Ochi, Akio Maruyama, Kyoichi Teramoto, Toshihiro Kikuchi, Akio Koganei, Takayuki Sumida
  • Patent number: 7618760
    Abstract: A two-component developer suppresses burying of an external additive into toner particles and a change in charging performance of a toner with time, and secures stable development performance. The two-component developer includes a toner and a carrier and is adjusted so that a rate of change ?A % in BET specific surface area A (m2/g) of the toner (=((A120?A1)/A1)×100) and a rate of change ?C % in charge quantity C (?C/g) of the carrier (=((C120?C1)/C1)×100) when a mixture of the toner and the carrier is stirred and mixed are both within 10 %. A1and A120 indicate BET specific surface areas of the toner when the mixture of the toner and the carrier is stirred and mixed for 1 minute and 120 minutes, and C1 and C120 indicate charge quantities of the carrier when the mixture is stirred and mixed for 1 minute and 120 minutes.
    Type: Grant
    Filed: February 21, 2007
    Date of Patent: November 17, 2009
    Assignee: Kyocera Mita Corporation
    Inventor: Seiji Kikushima
  • Patent number: 7618761
    Abstract: A toner for electrostatic image development comprising a binder resin and a colorant, the toner having a content of an aluminum element with respect to carbon of approximately 0.005 atm % to approximately 0.02 atm % as measured by X-ray photo-electron spectroscopy.
    Type: Grant
    Filed: February 8, 2007
    Date of Patent: November 17, 2009
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Shoji, Hiroshi Nakazawa, Masanobu Ninomiya, Shuji Sato, Eisuke Iwazaki
  • Patent number: 7618756
    Abstract: A photoconductor containing a supporting substrate, a photogenerating layer; and at least one charge transport layer where the photogenerating layer contains a photogenerating pigment and a chelating additive or agent.
    Type: Grant
    Filed: March 6, 2007
    Date of Patent: November 17, 2009
    Assignee: Xerox Corporation
    Inventors: Jin Wu, Kent J. Evans, Dennis J. Prosser, Liang-Bih Lin, Raymond K. Crandall
  • Patent number: 7615326
    Abstract: A charge transporting substance having three stilbene structures or butadiene structures in a molecule, represented by the following general formula is used as an organic photoconductive material. An electrophotographic photoconductor is prepared by causing a photosensitive layer which is disposed on a conductive support, to contain the organic photoconductive material in order to dispose the photoconductor to an image forming apparatus.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: November 10, 2009
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Takatsugu Obata, Akihiro Kondoh