Patents Examined by Mark A. Chapman
  • Patent number: 11392051
    Abstract: An image forming method includes: forming a toner image on a print medium by using a toner including toner particles having a binder resin which contains a condensate of straight-chain diol having 2 to 6 carbon atoms, an alkylene oxide adduct of bisphenol A and polyvalent carboxylic acid; and applying, to the toner image, a fixing solution containing an ester-based softening agent having a boiling point of not less than 180° C. so as to fix the toner image to the print medium.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: July 19, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Takayuki Higuchi, Tatsuya Ezaka, Norihiro Hirai, Hisakazu Tajima
  • Patent number: 11333990
    Abstract: An image forming method includes: forming a toner image on a print medium by using a toner including toner particles having a binder resin which contains a condensate of straight-chain diol having 2 to 6 carbon atoms, an alkylene oxide adduct of bisphenol A and polyvalent carboxylic acid; and applying, to the toner image, a fixing solution containing an ester-based softening agent having a boiling point of not less than 180° C. so as to fix the toner image to the print medium.
    Type: Grant
    Filed: June 17, 2020
    Date of Patent: May 17, 2022
    Assignee: BROTHER KOGYO KABUSHIKI KAISHA
    Inventors: Takayuki Higuchi, Tatsuya Ezaka, Norihiro Hirai, Hisakazu Tajima
  • Patent number: 11314178
    Abstract: A toner containing a toner particle, wherein, when a dielectric loss tangent measured at a frequency of 10 kHz in an impedance measurement on the toner in an environment having a temperature of 50° C. and a relative humidity of 50% RH is designated by tan ?50° C.(1), and a dielectric loss tangent measured at a frequency of 10 kHz in an impedance measurement on the toner in an environment having a temperature of 30° C. and a relative humidity of 50% RH after the impedance measurement on the toner in an environment having a temperature of 50° C. and a relative humidity of 50% RH is designated by tan ?30° C.(2), tan ?50° C.(1) is from 0.015 to 0.050, the relationship tan ?50° C.(1)>tan ?30° C.(2) is satisfied, and tan ?30° C.(2)/tan ?50° C.(1) is from 0.25 to 0.66.
    Type: Grant
    Filed: July 22, 2020
    Date of Patent: April 26, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Kenmoku, Kenta Kamikura, Yuzo Seino
  • Patent number: 11307510
    Abstract: An object of the present invention is to provide an electrophotographic photoreceptor which can prevent an increase in potential even using a fluorine resin in a charge transport layer, and can achieve both electrical properties and abrasion resistance, and present invention relates to a lamination type electrophotographic photoreceptor, in which a charge transport layer of the lamination type electrophotographic photoreceptor contains a compound having an E_homo of ?4.550 eV or more based on structure optimization calculation by density functional calculation B3LYP/6-31G (d, p) and fluorine resin particles, and a content of the fluorine resin particles is 3% by weight to 20% by weight based on a total mass of the charge transport layer.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: April 19, 2022
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Mitsuo Wada, Wataru Miyashita, Takahiro Choda, Akira Ando, Hiroe Fuchigami
  • Patent number: 11300893
    Abstract: A toner for developing an electrostatic latent image includes a plurality of toner particles. Each of the plurality of toner particles includes an additive attached to a surface of the particle, such that, when the plurality of toner particles are measured by X-ray fluorescence (XRF) spectrometry, an X-ray fluorescence intensity of lanthanum [La] (unit: kcps) and an X-ray fluorescence intensity of strontium [Sr] (unit: kcps) measured by the XRF spectrometry of the toner satisfy the following conditions (1) and (2): 0.2 kcps<[La]<2 kcps ??(1), and 100 kcps<[Sr]<800 kcps ??(2).
    Type: Grant
    Filed: July 26, 2018
    Date of Patent: April 12, 2022
    Assignee: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
    Inventors: Se Young Yoon, Yo Da Shin, Woo Chui Jung
  • Patent number: 11294295
    Abstract: A developer includes a metallic pigment and a binder resin. The developer includes a fine powder having a particle size smaller than a mode value in a volume particle size distribution of the metallic pigment. A proportion of the fine powder relative to the developer is equal to or higher than 4.6 percent and equal to or lower than 9.6 percent.
    Type: Grant
    Filed: February 12, 2020
    Date of Patent: April 5, 2022
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Manami Hiraide
  • Patent number: 11287758
    Abstract: Provided is a toner has a toner particle containing a binder resin and is characterized in that the binder resin contains a polymer A, which is a polymer of a composition containing a first polymerizable monomer, a second polymerizable monomer and a crosslinking agent, the first polymerizable monomer is at least one monomer selected from the group consisting of (meth)acrylic acid esters having an alkyl group with 18 to 36 carbon atoms, the crosslinking agent has two or more polymerizable double bonds, a content of the first polymerizable monomer in the composition is 5.0 to 60.0 mol %, a content of the second polymerizable monomer is 20.0 to 95.0 mol %, and when the SP values of the first polymerizable monomer, the second polymerizable monomer and the crosslinking agent are denoted by SP12, SP22 and SPC2, respectively, the formulae 0.60?(SP22?SP12)?15.00 and SP12<SPC2<(SP22+3.00) are satisfied.
    Type: Grant
    Filed: June 22, 2020
    Date of Patent: March 29, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takashi Matsui, Kenta Kamikura, Kenji Aoki, Masao Suzuki, Tsutomu Shimano, Reo Tagawa
  • Patent number: 11281118
    Abstract: A toner comprising base particles and external additive particles covering the base particles is provided. The base particles comprise a binder resin and a colorant. The external additive particles comprise at least one member selected from the group consisting of fluorine-containing aluminum hydroxide, fluorine-containing boehmite, and fluorine-containing pseudoboehmite.
    Type: Grant
    Filed: July 15, 2020
    Date of Patent: March 22, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Shinya Hanatani, Masayuki Ishii, Hyo Shu
  • Patent number: 11281119
    Abstract: According to various embodiments, there is provided a toner composition and a developer. The toner composition includes toner particles including a resin, a colorant; and a surface additive applied to a surface of the toner particles. The surface additive includes polyaniline doped strontium titanate (SrTiO3).
    Type: Grant
    Filed: September 24, 2020
    Date of Patent: March 22, 2022
    Assignees: Xerox Corporation, Clarkson University
    Inventors: Elizabeth K. Priebe, Christopher Michael Wolfe, Chieh-Min Cheng, Jordan A. Frank, Richard Partch
  • Patent number: 11262667
    Abstract: A magnetic toner includes toner particles. The toner particles each include a toner mother particle and an external additive attached to a surface of the toner mother particle. The toner mother particles contain a binder resin and a magnetic powder. The external additive includes resin particles as external additive particles. The resin particles have a blocking rate of no greater than 40% by mass. The resin particles have a number average primary particle diameter of at least 40 nm and no greater than 120 nm. A resin constituting the resin particles is a vinyl resin including repeating units represented by general formulas (1) and (2), and a repeating unit derived from a sulfo group-containing vinyl compound. The content of the repeating unit derived from the sulfo group-containing vinyl compound in the vinyl resin is at least 0.1 mol % and no greater than 3.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: March 1, 2022
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Toru Takatsuna, Sho Sumioka
  • Patent number: 11256185
    Abstract: A photoconductive drum includes an elongated support element with a shaped charge generation layer. The layer extends from the support element at various thicknesses along a length thereof. Thicker charge generation portions provides denser optical densities compared to thinner portions allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. A charge transport layer overcoats the charge generation layer. Optionally, an oxidation layer underlies the charge generation layer as does a protective overcoat overlying the charge transport layer. Various thicknesses and shapes of the charge generation layer are also disclosed.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: February 22, 2022
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Matthew David Heid, Laura Lee Kierstein, Weimei Luo, Prasanna Shrestha
  • Patent number: 11256189
    Abstract: A toner container used in an image forming apparatus including an exposure unit with a light emitting diode light source. The toner container including a container body, and a cyan toner stored in the container body. The cyan toner includes a binder resin, at least one pigment, a charge control agent, and an external additive. The at least one pigment includes at least Pigment Blue. A lightness L*, a hue a*, and a hue b* of the cyan toner in a powder state satisfy: 30.04?L*?33.68, ?1.75?a*?0.71, and ?47.47?b*??45.08.
    Type: Grant
    Filed: September 21, 2020
    Date of Patent: February 22, 2022
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hideharu Kuwabara, Shin Yamada
  • Patent number: 11256187
    Abstract: Provided are a process cartridge and an electrophotographic apparatus each of which is reduced in fogging for reducing a toner consumption. Specifically, provided is a process cartridge, which is removably mounted onto a main body of an electrophotographic apparatus, the process cartridge including: a developing unit containing a toner; and an electrophotographic photosensitive member, wherein the toner is a toner including a toner particle, and has a polyvalent acid metal salt on at least part of a surface of the toner particle, wherein the polyvalent acid metal salt includes at least one kind of metal element selected from metal elements belonging to from Group 3 to Group 13, and wherein a surface layer of the electrophotographic photosensitive member contains a resin including a siloxane segment.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: February 22, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Harunobu Ogaki, Kazunori Noguchi, Takeshi Murakami, Takashi Kenmoku, Yuzo Seino, Kenta Kamikura
  • Patent number: 11249408
    Abstract: A toner including a toner particle including a binder resin, wherein fine particles A and B are present on a surface of the toner particle; the fine particles A are a fatty acid metal salt; the fine particles B have a specific volume resistivity; an average theoretical surface area of the toner particle, an amount of the fine particles A, and a coverage ratio of the toner particle surface by the fine particles A satisfy a specific relationship; the amount of the fine particles B is in a specific range; and a proportion F of an area occupied by a part of the fine particles B embedded in a surface vicinity region of the toner in a total area occupied by the fine particles B present in a cross section of one particle of the toner is 50% by area or more.
    Type: Grant
    Filed: June 25, 2020
    Date of Patent: February 15, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shohei Tsuda, Tsuneyoshi Tominaga, Masatake Tanaka, Taiji Katsura, Masamichi Sato
  • Patent number: 11249412
    Abstract: Toner comprising a toner particle, the toner particle includes a toner core particle and an organosilicon polymer covering the toner core particle surface, the organosilicon polymer has a structure represented by R4—SiO3/2 (R4 each independently represents an alkyl group having 1 to 6 carbon atoms or a phenyl group), the toner core particle includes a resin A having a substituted or unsubstituted silyl group in a molecule thereof, a substituent of the substituted silyl group is at least one selected from the group consisting of an alkyl group having 1 or more carbon atoms, an alkoxy group having 1 or more carbon atoms, a hydroxy group, a halogen atom, and an aryl group having 6 or more carbon atoms, a content of silicon atoms in the resin A is 0.02 to 10.00% by mass, and a content of silicon atoms in the organosilicon polymer is 30 to 50% by mass.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: February 15, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masashi Kawamura, Takayuki Toyoda, Kenji Ookubo, Taku Shimoda
  • Patent number: 11249407
    Abstract: The electrophotographic photosensitive member has: a cylindrical support; a charge generating layer formed on the cylindrical support; and a charge transport layer formed on the charge generating layer, the charge generating layer contains a hydroxygallium phthalocyanine crystal having a particular CuK? characteristic X-ray diffraction peak, a titanyl phthalocyanine crystal having a particular CuK? characteristic X-ray diffraction peak or a chlorogallium phthalocyanine crystal having a particular spectral absorption spectrum as a charge generating material, and in the charge generating layer, with respect to the film thickness of the charge generating layer, when a region from the central position of an image forming area to the end position of the image forming area is divided in the axial direction of the cylindrical support into five equal regions and the average film thickness of the charge generating layer in each region satisfies a specific condition.
    Type: Grant
    Filed: June 18, 2020
    Date of Patent: February 15, 2022
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kaname Watariguchi, Tomohito Ishida, Masataka Kawahara, Michiyo Sekiya, Kohei Makisumi
  • Patent number: 11249406
    Abstract: Shaping a photoconductive drum includes preparing a dispersion having a charge generation composition and dipping an elongated support element into the dispersion. Withdrawing from the dispersion portions of the support element at different speeds results in different thicknesses of charge generation composition on the support element. Faster withdrawal results in thicker charge generation composition than does slower withdrawal. Portions with thicker composition provide denser optical densities compared to thinner composition allowing tailoring the photoconductive drum to compensate for imperfect optical scanning systems. Coating the support element with a charge transport layer occurs next, then curing. Oxidation of the support element may occur prior to application of the charge generation composition. A protective overcoat may also exist over the charge transport layer.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: February 15, 2022
    Assignee: LEXMARK INTERNATIONAL, INC.
    Inventors: Matthew David Heid, Laura Lee Kierstein, Weimei Luo, Prasanna Shrestha
  • Patent number: 11226570
    Abstract: A toner comprising a binder resin and a release agent is provided. When the toner is subjected to a FTIR-ATR mapping within a measurement range in a 50 ?m square, divided in 1,024 pixels each in a 1.56 ?m square, an average value of an intensity ratio of an absorption spectrum peak at a wavenumber of 2850 cm?1 to an absorption spectrum peak at a wavenumber of 828 cm?1 in each of the pixels is from 0.10 to 0.19, and a proportion of pixels in which the intensity ratio is 0.20 or higher to all the pixels is from 5% to 10%.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: January 18, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kohei Hayasaka, Tohru Moriya, Yousuke Suzuki, Atsushi Sasai, Kazuki Washizu
  • Patent number: 11226569
    Abstract: The magenta toner is excellent in image density, has an enhanced chargeability, and can be produced at a low cost. The magenta toner includes a binder resin and a magenta colorant. A compound A represented by the following general formula (1) and C.I. Solvent Violet 59 are contained as the magenta colorant.
    Type: Grant
    Filed: June 22, 2020
    Date of Patent: January 18, 2022
    Assignee: ZEON CORPORATION
    Inventor: Masashi Watanabe
  • Patent number: 11215936
    Abstract: A toner is provided. The toner comprises a binder resin, a release agent, and a function imparting agent comprising a fatty acid amide having a melting point of from 110 to 160 degrees C. When the toner is heated by a differential scanning calorimeter, the toner exhibits no endothermic peak within a temperature range of ±20 degrees C. of a temperature at a highest endothermic peak derived from the fatty acid amide.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: January 4, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Namie Suzuki, Yoshitaka Yamauchi