Patents by Inventor Toyoshi Sawada

Toyoshi Sawada has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12019394
    Abstract: A toner includes polyolefin and has an exothermic peak in a range from 40° C. to 70° C. in a cooling process of the polyolefin by the DSC after a first heating process of the polyolefin by DSC. The polyolefin does not have an exothermic peak in the cooling process of the polyolefin by the DSC after the first heating process of the polyolefin by the DSC, and has an exothermic peak in a range from 0° C. to 30° C. in a second heating process of the polyolefin by the DSC.
    Type: Grant
    Filed: August 27, 2021
    Date of Patent: June 25, 2024
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Katsunori Kurose, Akihiro Kaneko, Motoshi Iizuka
  • Publication number: 20240160121
    Abstract: A toner has a softening point Ts of below 50 degrees C. and a tangent method glass transition temperature Tg2nd of below 0 degrees C.
    Type: Application
    Filed: November 14, 2023
    Publication date: May 16, 2024
    Applicant: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Katsunori Kurose, Motoshi Iizuka
  • Publication number: 20240103408
    Abstract: An image forming method includes forming an electrostatic latent image on an electrostatic latent image bearer, developing the electrostatic image with a toner to form a visible image, transferring the visible image onto a recording medium, and fixing the transferred visible image on the recording medium. The toner includes toner base particles each including a binder resin, a release agent, and particles of an inorganic antibacterial antiviral agent, and satisfies conditions (1) to (3) below. The image forming method satisfies a relationship of 2.0X (micrometers)?Z?2.5X (micrometers). Conditions (1) the number average particle diameter X of the particles of the inorganic antibacterial antiviral agent is 1.5 (micrometers)?X?2.5 (micrometers), (2) 3X (micrometers)?Y?4X (micrometers), and (3) an amount of the inorganic antibacterial antiviral agent in the toner is 2.8% by mass or greater, but 5.0% by mass or less.
    Type: Application
    Filed: December 27, 2021
    Publication date: March 28, 2024
    Applicant: Ricoh Company, Ltd.
    Inventors: Kazumi SUZUKI, Toyoshi Sawada, Katsunori Kurose, Akihiro Kaneko
  • Publication number: 20230288841
    Abstract: An image forming apparatus includes an electrostatic latent image bearer, an electrostatic latent image former, a developing device, a transfer device, and a fixing device. The electrostatic latent image former forms an electrostatic latent image on the electrostatic latent image bearer. The developing device develops the electrostatic latent image with a developer to form a toner image. The transfer device transfers the toner image on a recording medium. The fixing device fixes the toner image on the recording medium. The developer contains an adhesive medium and foamable particles.
    Type: Application
    Filed: March 3, 2023
    Publication date: September 14, 2023
    Inventors: Yuki KUMAKI, Kenji YABE, Toyoshi SAWADA, Kazumi SUZUKI
  • Patent number: 11733619
    Abstract: Printed matter is provided which includes a recording medium, a colored layer overlying the recording medium, and an infrared-absorbing-pigment-containing layer overlying the recording medium and underlying the colored layer. The colored layer contains a colorant. The infrared-absorbing-pigment-containing layer contains an infrared absorbing pigment having an average diameter of from 120 to 250 nm in the infrared-absorbing-pigment-containing layer.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: August 22, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Kazumi Suzuki, Masaki Yoshino, Nekka Matsuura, Toyoshi Sawada, Akihiro Kaneko
  • Patent number: 11635711
    Abstract: An image forming method is provided. The image forming method includes: forming an electrostatic latent image on an electrostatic latent image bearer; developing the electrostatic latent image on the electrostatic latent image bearer with a toner to form a toner image; transferring the toner image from the electrostatic latent image bearer onto a continuous resin film; fixing the toner image on the continuous resin film with a heat roller or a heat belt. The toner contains a maleic-acid-modified polyolefin having a polypropylene block in a main chain.
    Type: Grant
    Filed: March 19, 2021
    Date of Patent: April 25, 2023
    Assignee: Ricoh Company, Ltd.
    Inventors: Minoru Masuda, Kazumi Suzuki, Toyoshi Sawada, Akira Azami
  • Patent number: 11537057
    Abstract: A toner is provided. The toner comprises a maleic-acid-modified polyolefin having a polypropylene block in a main chain and having a weight average molecular weight of 60,000 or more.
    Type: Grant
    Filed: April 7, 2020
    Date of Patent: December 27, 2022
    Assignee: RICOH COMPANY, LTD.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Katsunori Kurose, Akihiro Kaneko
  • Publication number: 20220066344
    Abstract: A toner includes polyolefin and has an exothermic peak in a range from 40° C. to 70° C. in a cooling process of the polyolefin by the DSC after a first heating process of the polyolefin by DSC. The polyolefin does not have an exothermic peak in the cooling process of the polyolefin by the DSC after the first heating process of the polyolefin by the DSC, and has an exothermic peak in a range from 0° C. to 30° C. in a second heating process of the polyolefin by the DSC.
    Type: Application
    Filed: August 27, 2021
    Publication date: March 3, 2022
    Applicant: Ricoh Company, Ltd.
    Inventors: Toyoshi SAWADA, Kazumi Suzuki, Katsunori Kurose, Akihiro Kaneko, Motoshi Iizuka
  • Publication number: 20210341851
    Abstract: Printed matter is provided which includes a recording medium, a colored layer overlying the recording medium, and an infrared-absorbing-pigment-containing layer overlying the recording medium and underlying the colored layer. The colored layer contains a colorant. The infrared-absorbing-pigment-containing layer contains an infrared absorbing pigment having an average diameter of from 120 to 250 nm in the infrared-absorbing-pigment-containing layer.
    Type: Application
    Filed: November 27, 2019
    Publication date: November 4, 2021
    Inventors: Kazumi SUZUKI, Masaki YOSHINO, Nekka MATSUURA, Toyoshi SAWADA, Akihiro KANEKO
  • Publication number: 20210311416
    Abstract: An image forming method is provided. The image forming method includes: forming an electrostatic latent image on an electrostatic latent image bearer; developing the electrostatic latent image on the electrostatic latent image bearer with a toner to form a toner image; transferring the toner image from the electrostatic latent image bearer onto a continuous resin film; fixing the toner image on the continuous resin film with a heat roller or a heat belt. The toner contains a maleic-acid-modified polyolefin having a polypropylene block in a main chain.
    Type: Application
    Filed: March 19, 2021
    Publication date: October 7, 2021
    Inventors: Minoru MASUDA, Kazumi SUZUKI, Toyoshi SAWADA, Akira AZAMI
  • Patent number: 11061344
    Abstract: Provided is a toner including a binder resin and a colorant, wherein the colorant includes Solvent Red 49, and an acid value of the toner is 9.0 mgKOH/g or greater but 30.0 mgKOH/g or less.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: July 13, 2021
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Natsuko Matsushita, Yu Naito
  • Publication number: 20210018855
    Abstract: Provided is a toner including a binder resin and a colorant, wherein the colorant includes Solvent Red 49, and an acid value of the toner is 9.0 mgKOH/g or greater but 30.0 mgKOH/g or less.
    Type: Application
    Filed: April 6, 2018
    Publication date: January 21, 2021
    Inventors: Toyoshi SAWADA, Kazumi SUZUKI, Natsuko MATSUSHITA, Yu NAITO
  • Publication number: 20200333720
    Abstract: A toner is provided. The toner comprises a maleic-acid-modified polyolefin having a polypropylene block in a main chain and having a weight average molecular weight of 60,000 or more.
    Type: Application
    Filed: April 7, 2020
    Publication date: October 22, 2020
    Inventors: Toyoshi SAWADA, Kazumi SUZUKI, Katsunori KUROSE, Akihiro KANEKO
  • Patent number: 10620557
    Abstract: A toner comprising a binder resin and a near-infrared light absorbing material is provided. The toner in the form of a pellet has: a chroma C* of 20 or less in the L*C*h color space; a hue angle h of from 50 to 90 degrees in the L*C*h color space; and a spectral reflectance of 5% or less at a wavelength of from 800 to 900 nm.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: April 14, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Yu Naito, Akihiro Kaneko
  • Patent number: 10564571
    Abstract: A toner set for use in an image forming apparatus is provided. The toner set includes a fluorescent toner and a color toner. The fluorescent toner comprises a binder resin and a fluorescent agent. The color toner comprises a binder resin and a colorant. A 60-degree gloss value (Gf) of a solid image of the fluorescent toner is in a range of from 10 to 25, and a difference (Gn?Gf) between a 60-degree gloss value (Gn) of a solid image of the color toner and the 60-degree gloss value (Gf) of the solid image of the fluorescent toner is in a range of from 10 to 28.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: February 18, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazumi Suzuki, Toyoshi Sawada, Yu Naito, Natsuko Matsushita
  • Publication number: 20200033745
    Abstract: A toner comprising a binder resin and a near-infrared light absorbing material is provided. The toner in the form of a pellet has: a chroma C* of 20 or less in the L*C*h color space; a hue angle h of from 50 to 90 degrees in the L*C*h color space; and a spectral reflectance of 5% or less at a wavelength of from 800 to 900 nm.
    Type: Application
    Filed: July 18, 2019
    Publication date: January 30, 2020
    Inventors: Toyoshi SAWADA, Kazumi SUZUKI, Yu NAITO, Akihiro KANEKO
  • Patent number: 10451987
    Abstract: A toner includes a europium complex represented by the following Chemical formula where A represents 2-naphthyl group, 2-naphthyl group having a substitution group selected from the group consisting of an alkyl group, an alkoxy group, and a halogen, R represents a fluoroalkyl group having one to three carbon atoms or a methyl group, and R1, R2, R3, and R4 each, independently represent hydrogen atoms, alkyl groups, or aryl groups, wherein the toner has a hydroxyl value of from 20 to 40 mgKOH/g.
    Type: Grant
    Filed: December 5, 2018
    Date of Patent: October 22, 2019
    Assignee: Ricoh Company, Ltd.
    Inventors: Toyoshi Sawada, Kazumi Suzuki, Yu Naito
  • Publication number: 20190196349
    Abstract: A toner includes a europium complex represented by the following Chemical formula where A represents 2-naphthyl group, 2-naphthyl group having a substitution group selected from the group consisting of an alkyl group, an alkoxy group, and a halogen, R represents a fluoroalkyl group having one to three carbon atoms or a methyl group, and R1, R2, R3, and R4 each, independently represent hydrogen atoms, alkyl groups, or aryl groups, wherein the toner has a hydroxyl value of from 20 to 40 mgKOH/g.
    Type: Application
    Filed: December 5, 2018
    Publication date: June 27, 2019
    Inventors: Toyoshi SAWADA, Kazumi SUZUKI, Yu NAITO
  • Publication number: 20190086834
    Abstract: A toner set for use in an image forming apparatus is provided. The toner set includes a fluorescent toner and a color toner. The fluorescent toner comprises a binder resin and a fluorescent agent. The color toner comprises a binder resin and a colorant. A 60-degree gloss value (Gf) of a solid image of the fluorescent toner is in a range of from 10 to 25, and a difference (Gn?Gf) between a 60-degree gloss value (Gn) of a solid image of the color toner and the 60-degree gloss value (Gf) of the solid image of the fluorescent toner is in a range of from 10 to 28.
    Type: Application
    Filed: September 18, 2018
    Publication date: March 21, 2019
    Inventors: Kazumi SUZUKI, Toyoshi Sawada, Yu Naito, Natsuko Matsushita
  • Patent number: 9885967
    Abstract: Provided is a resin for a toner, which is a copolymer including a crystalline segment, and having a maximum elastic stress value at 100° C. (ES100) of 1,000 Pa or less, and a maximum elastic stress value at 70° C. (ES70) of 1,000 Pa or greater when the temperature is lowered from 100° C. to 70° C., where the maximum elastic stress values are measured according to a large amplitude oscillatory shear procedure.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: February 6, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Azumi Miyaake, Daisuke Asahina, Toyoshi Sawada, Hiroshi Yamashita, Tsuyoshi Sugimoto, Shinya Nakayama, Susumu Chiba, Satoyuki Sekiguchi