Patents by Inventor Tomoyasu ASAKAWA

Tomoyasu ASAKAWA 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: 10444648
    Abstract: A magnetic toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner cores contain a polyester resin and a magnetic powder. The magnetic powder includes specific magnetic particles. The shell layers contain a specific vinyl resin.
    Type: Grant
    Filed: July 12, 2018
    Date of Patent: October 15, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Patent number: 10248040
    Abstract: An electrostatic latent image developing carrier includes carrier particles each including a carrier core and first and second coat layers covering a surface of the carrier core. The first and second coat layers give a layered structure in which the first coat layer and the second coat layer are layered in order from the surface of the carrier core. The first coat layer contains a fluororesin. The second coat layer contains a silicone resin and a fluorine silane in an amount of at least 1% by mass relative to a mass of the silicone resin. An area SA of a region of a surface region of the first coat layer that is covered with the second coat layer and an area SB of a region thereof that is not covered with the second coat layer satisfy a relationship represented by “0.05?SB/(SA+SB)?0.50”.
    Type: Grant
    Filed: August 24, 2018
    Date of Patent: April 2, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Publication number: 20190064689
    Abstract: An electrostatic latent image developing carrier includes carrier particles each including a carrier core and first and second coat layers covering a surface of the carrier core. The first and second coat layers give a layered structure in which the first coat layer and the second coat layer are layered in order from the surface of the carrier core. The first coat layer contains a fluororesin. The second coat layer contains a silicone resin and a fluorine silane in an amount of at least 1% by mass relative to a mass of the silicone resin. An area SA of a region of a surface region of the first coat layer that is covered with the second coat layer and an area SB of a region thereof that is not covered with the second coat layer satisfy a relationship represented by “0.05?SB/(SA+SB)?0.50”.
    Type: Application
    Filed: August 24, 2018
    Publication date: February 28, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu ASAKAWA
  • Publication number: 20190025723
    Abstract: A magnetic toner includes toner particles. The toner particles each include a toner core and a shell layer covering a surface of the toner core. The toner cores contain a polyester resin and a magnetic powder. The magnetic powder includes specific magnetic particles. The shell layers contain a specific vinyl resin.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 24, 2019
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu ASAKAWA
  • Patent number: 10180633
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a toner mother particle and inorganic particles attached to a surface of the toner mother particle. The toner mother particle includes a toner core (11) and a shell layer (12) covering a surface of the toner core (11). The shell layer (12) includes film-shaped first domains (12a) and particle-shaped second domains (12b). The first domains (12a) are substantially formed from a non-cross-linked resin. The second domains (12b) are substantially formed from a cross-linked resin. The cross-linked resin has a glass transition point higher by 40° C. or more than that of the non-cross-linked resin. The first domains (12a) have a surface adsorption force of at least 20.0 nN and no greater than 40.0 nN. The second domains (12b) have a surface adsorption force of at least 4.0 nN and less than 20.0 nN.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: January 15, 2019
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Patent number: 10048606
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core and a shell layer. The shell layer includes a first domain that is a non-crosslinked resin film and second domains that are crosslinked resin particles. The crosslinked resin has a higher glass transition point than the non-crosslinked resin. In a cross-sectional image of a toner particle, a proportion of a total length of a surface region of the core covered by the first domain is at least 45% and no greater than 80% relative to a circumferential length of the core. In a cross-sectional image of a toner particle, a proportion of second domains adhering to a surface of the first domain is at least 30% by number and no greater than 70% by number relative to all the second domains included in the toner particle.
    Type: Grant
    Filed: June 30, 2017
    Date of Patent: August 14, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu Asakawa
  • Publication number: 20180095375
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a toner mother particle and inorganic particles attached to a surface of the toner mother particle. The toner mother particle includes a toner core (11) and a shell layer (12) covering a surface of the toner core (11). The shell layer (12) includes film-shaped first domains (12a) and particle-shaped second domains (12b). The first domains (12a) are substantially formed from a non-cross-linked resin. The second domains (12b) are substantially formed from a cross-linked resin. The cross-linked resin has a glass transition point higher by 40° C. or more than that of the non-cross-linked resin. The first domains (12a) have a surface adsorption force of at least 20.0 nN and no greater than 40.0 nN. The second domains (12b) have a surface adsorption force of at least 4.0 nN and less than 20.0 nN.
    Type: Application
    Filed: December 28, 2016
    Publication date: April 5, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu ASAKAWA
  • Publication number: 20180017884
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core and a shell layer. The shell layer includes a first domain that is a non-crosslinked resin film and second domains that are crosslinked resin particles. The crosslinked resin has a higher glass transition point than the non-crosslinked resin. In a cross-sectional image of a toner particle, a proportion of a total length of a surface region of the core covered by the first domain is at least 45% and no greater than 80% relative to a circumferential length of the core. In a cross-sectional image of a toner particle, a proportion of second domains adhering to a surface of the first domain is at least 30% by number and no greater than 70% by number relative to all the second domains included in the toner particle.
    Type: Application
    Filed: June 30, 2017
    Publication date: January 18, 2018
    Applicant: KYOCERA Document Solutions Inc.
    Inventor: Tomoyasu ASAKAWA
  • Patent number: 9864289
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core containing a binder resin and a shell layer covering a surface of the core. The shell layer contains a copolymer of at least two vinyl compounds including a compound represented by the following formula (1). The toner contains a ring unopened oxazoline group in an amount of at least 0.10 ?mol/g and no greater than 100 ?mol/g.
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: January 9, 2018
    Assignee: KYOCERA Document Solutions Inc.
    Inventors: Haruhiro Nishitera, Tomoyasu Asakawa
  • Publication number: 20170248860
    Abstract: An electrostatic latent image developing toner includes a plurality of toner particles each including a core containing a binder resin and a shell layer covering a surface of the core. The shell layer contains a copolymer of at least two vinyl compounds including a compound represented by the following formula (1). The toner contains a ring unopened oxazoline group in an amount of at least 0.10 ?mol/g and no greater than 100 ?mol/g.
    Type: Application
    Filed: February 23, 2017
    Publication date: August 31, 2017
    Applicant: KYOCERA Document Solutions Inc.
    Inventors: Haruhiro NISHITERA, Tomoyasu ASAKAWA