Patents by Inventor Ryuta Yoshida

Ryuta Yoshida 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 and developer
    Patent number: 9316938
    Abstract: A toner including a non-crystalline polyester resin and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of 3,000 to 8,000 measured by gel permeation chromatography, and wherein the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass transition temperature B after the extraction process of the toner with methanol, and a difference between A and B (B?A) is 2.0° C. or less.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: April 19, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Masaki Watanabe, Satoshi Ogawa, Teruki Kusahara, Ryuta Yoshida
  • TONER AND DEVELOPER
    Publication number: 20140322643
    Abstract: A toner including a non-crystalline polyester resin and a crystalline polyester resin, wherein a tetrahydrofuran soluble component of the non-crystalline polyester resin has a weight-average molecular weight of 3,000 to 8,000 measured by gel permeation chromatography, and wherein the toner has a glass transition temperature A before an extraction process of the toner with methanol and a glass transition temperature B after the extraction process of the toner with methanol, and a difference between A and B (B?A) is 2.0° C. or less.
    Type: Application
    Filed: October 17, 2012
    Publication date: October 30, 2014
    Inventors: Masaki Watanabe, Satoshi Ogawa, Teruki Kusahara, Ryuta Yoshida