Patents by Inventor Yukari Fukuda

Yukari Fukuda 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).

  • Toner, developer, and color toner set
    Patent number: 9557670
    Abstract: A toner, including: a binder resin; and a colorant, wherein the toner has a storage modulus of 1.0×107 Pa or more at 50° C., a loss modulus of 8.0×104 Pa to 2.0×105 Pa at 80° C., and a loss modulus of 2.0×102 Pa to 1.0×103 Pa at 160° C.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: January 31, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Masana Shiba, Hiroshi Yamashita, Tsuyoshi Sugimoto, Daisuke Asahina, Yukari Fukuda, Rintaro Takahashi, Satoyuki Sekiguchi
  • Toner for forming electrostatic image, developer, process cartridge, and image forming apparatus
    Patent number: 9239530
    Abstract: To provide a toner, which contains a colorant, a binder resin, and a releasing agent, wherein the toner satisfies the following (a) to (c): (a) the toner contains at least a polyester resin as the binder resin; (b) the toner has Tg1st of 25° C. to 50° C.; and (c) the toner has a TMA compressive deformation rate (TMA %) of 10% or lower at 50° C. under a condition having relative humidity of 70%, wherein the Tg1st is glass transition temperature of the toner for first heating, as the toner is measured by a DSC system (a differential scanning calorimeter).
    Type: Grant
    Filed: September 12, 2013
    Date of Patent: January 19, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Daisuke Asahina, Hiroshi Yamashita, Masana Shiba, Tsuyoshi Sugimoto, Yukari Fukuda, Rintaro Takahashi
  • Yellow toner and color image forming method
    Patent number: 8986916
    Abstract: A yellow toner including: a non-crystalline resin; C.I. Pigment Yellow 185; and a releasing agent, wherein the yellow toner has a glass transition temperature of more than 18° C. but less than 40° C.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: March 24, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Hiroshi Yamashita, Masana Shiba, Satoyuki Sekiguchi, Yukari Fukuda, Daisuke Asahina, Rintaro Takahashi, Tsuyoshi Sugimoto
  • TONER, DEVELOPER, AND COLOR TONER SET
    Publication number: 20150024312
    Abstract: A toner, including: a binder resin; and a colorant, wherein the toner has a storage modulus of 1.0×107 Pa or more at 50° C., a loss modulus of 8.0×104 Pa to 2.0×105 Pa at 80° C., and a loss modulus of 2.0×102 Pa to 1.0×103 Pa at 160° C.
    Type: Application
    Filed: February 28, 2013
    Publication date: January 22, 2015
    Inventors: Masana Shiba, Hiroshi Yamashita, Tsuyoshi Sugimoto, Daisuke Asahina, Yukari Fukuda, Rintaro Takahashi, Satoyuki Sekiguchi
  • Toner and developer
    Patent number: 8932789
    Abstract: To provide a toner, which contains: a non-crystalline polyester resin A obtained through a reaction between a non-linear chain reactive precursor and a curing agent, and having a glass transition temperature of ?60° C. to 0° C.; a non-crystalline polyester resin B having a glass transition temperature of 40° C. to 70° C.; and a crystalline polyester resin C, wherein the toner has a glass transition temperature Tg1st of 20° C. to 40° C. as measured with first heating in differential scanning calorimetry (DSC).
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: January 13, 2015
    Assignee: Ricoh Company, Ltd.
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Satoyuki Sekiguchi, Rintaro Takahashi, Masana Shiba, Yukari Fukuda, Saki Konno
  • TONER FOR FORMING ELECTROSTATIC IMAGE, DEVELOPER, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
    Publication number: 20140080046
    Abstract: To provide a toner, which contains a colorant, a binder resin, and a releasing agent, wherein the toner satisfies the following (a) to (c); (a) the toner contains at least a polyester resin as the binder resin; (b) the toner has Tg1st of 25° C. to 50° C.; and (c) the toner has a TMA compressive deformation rate (TMA %) of 10% or lower at 50° C. under a condition having relative humidity of 70%, wherein the Tg1st is glass transition temperature of the toner for first heating, as the toner is measured by a DSC system (a differential scanning calorimeter).
    Type: Application
    Filed: September 12, 2013
    Publication date: March 20, 2014
    Inventors: Daisuke ASAHINA, Hiroshi Yamashita, Masana Shiba, Tsuyoshi Sugimoto, Yukari Fukuda, Rintaro Takahashi
  • YELLOW TONER AND COLOR IMAGE FORMING METHOD
    Publication number: 20130171554
    Abstract: A yellow toner including: a non-crystalline resin; C.I. Pigment Yellow 185; and a releasing agent, wherein the yellow toner has a glass transition temperature of more than 18° C. but less than 40° C.
    Type: Application
    Filed: December 26, 2012
    Publication date: July 4, 2013
    Inventors: Hiroshi YAMASHITA, Masana Shiba, Satoyuki Sekiguchi, Yukari Fukuda, Daisuke Asahina, Rintaro Takahashi, Tsuyoshi Sugimoto
  • TONER AND DEVELOPER
    Publication number: 20130059247
    Abstract: To provide a toner, which contains: a non-crystalline polyester resin A obtained through a reaction between a non-linear chain reactive precursor and a curing agent, and having a glass transition temperature of ?60° C. to 0° C.; a non-crystalline polyester resin B having a glass transition temperature of 40° C. to 70° C.; and a crystalline polyester resin C, wherein the toner has a glass transition temperature Tg1st of 20° C. to 40° C. as measured with first heating in differential scanning calorimetry (DSC).
    Type: Application
    Filed: August 24, 2012
    Publication date: March 7, 2013
    Inventors: Tsuyoshi Sugimoto, Hiroshi Yamashita, Daisuke Asahina, Satoyuki Sekiguchi, Rintaro Takahashi, Masana Shiba, Yukari Fukuda, Saki Konno