Patents by Inventor Yoshitaka Sekiguchi

Yoshitaka Sekiguchi 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).

  • Publication number: 20050069801
    Abstract: The present invention provides a resin particle for toner, which is allowed to contain colorant particles and/or charge-controlling agent particles through a miniemulsion method, and a toner prepared with the resin particles aggregated/fused.
    Type: Application
    Filed: March 4, 2004
    Publication date: March 31, 2005
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Hiroyuki Yamasaki, Yoshitaka Sekiguchi, Chiyoshi Nozaki, Masahiro Anno
  • Publication number: 20050058927
    Abstract: A toner comprising: a core layer and a shell layer formed on the core layer, wherein the core layer and the shell layer respectively comprise a first wax and a second wax; the second wax having a melting point that is higher than a melting point of the first wax; the first wax having an average dispersion diameter that is smaller than the average dispersion diameter of the second wax; and the first wax having a content in the core layer that is greater than a content of the second wax in the shell layer.
    Type: Application
    Filed: March 29, 2004
    Publication date: March 17, 2005
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Yoshihiro Mikuriya, Tsuyoshi Nozaki, Masayuki Hagi, Atsushi Yamamoto, Yoshitaka Sekiguchi, Chiyoshi Nozaki
  • Patent number: 6841326
    Abstract: The present invention relates to toners for full color image-forming machine with specific external additives (kind, BET specific surface area etc.) added externally in combination to toner particles prepared by a wet granulation method, and a fixing method suitable for the toner.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: January 11, 2005
    Assignee: Minolta Co., Ltd.
    Inventors: Takeshi Arai, Masahiro Anno, Chikara Tsutsui, Minoru Nakamura, Yoshitaka Sekiguchi
  • Patent number: 6824168
    Abstract: A vehicle body rear part structure includes a rectangular support frame carrying thereon a cylindrical fuel tank and attached to left and right rear frames from below via left and right front brackets and left and right rear brackets so as to define therebetween a pair of laterally spaced openings generally corresponding in position to the axis of the fuel tank and receiving therein a pipe system of the fuel tank.
    Type: Grant
    Filed: August 28, 2002
    Date of Patent: November 30, 2004
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Masahiro Kawazu, Hiroshi Osato, Toshiaki Shimizu, Yoshitaka Sekiguchi, Tohru Ono, Masaru Shibasawa
  • Publication number: 20040142268
    Abstract: A toner includes a resin and a colorant, wherein the toner is obtained by carrying out a step of salting-out/fusing resin particles and colorant particles in a water-base medium, the toner having a compressive strength of 14 to 20, and a standard deviation of the compressive strength of smaller than 1.
    Type: Application
    Filed: September 18, 2003
    Publication date: July 22, 2004
    Applicants: Konica Minolta Holdings, Inc., Minolta Co., Ltd.
    Inventors: Takao Yamanouchi, Masafumi Uchida, Masahiro Anno, Yoshitaka Sekiguchi, Chikara Tsutsui
  • Publication number: 20040115553
    Abstract: A toner includes a resin and a colorant; wherein the toner is obtained by carrying out a step of salting-out/fusing resin particles and colorant particles in a water-base medium, the toner satisfying the following relationship: 0.88≦F25/F50≦1.0, where F25 represents an adhesive stress at a toner temperature of 25° C., and F50 represents an adhesive stress at a toner temperature of 50° C.
    Type: Application
    Filed: September 18, 2003
    Publication date: June 17, 2004
    Applicants: Konica Minolta Holdings, Inc., Minolta Co., Ltd.
    Inventors: Takao Yamanouchi, Masafumi Uchida, Masahiro Anno, Yoshitaka Sekiguchi, Minoru Nakamura
  • Publication number: 20040108677
    Abstract: A first suspension arm mounting structure for attaching left and right third lower arms as left and right suspension arms to a subframe is provided. The mounting structure includes a middle crossmember extended transversely across the subframe formed in a rectangular shape, and left and right lower brackets for mounting the left and right third lower arms thereto. The left and right lower brackets are integrally formed with left and right end portions of the middle crossmember.
    Type: Application
    Filed: October 30, 2003
    Publication date: June 10, 2004
    Applicant: HONDA MOTOR CO., LTD.
    Inventor: Yoshitaka Sekiguchi
  • Publication number: 20030189334
    Abstract: A vehicle body structure comprises a front floor under which a fuel cell stack case accommodating a fuel cell stack is disposed, and side sills and floor frames which extend along the sides of the vehicle, and on which a sub-frame having a fuel tank is installed. The front face of the sub-frame and the rear face of the fuel cell stack case are formed to be flat and oppose each other. According to the vehicle body structure, safety of the fuel tank against collision is greatly improved without a great increase in vehicle weight.
    Type: Application
    Filed: April 3, 2003
    Publication date: October 9, 2003
    Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
    Inventors: Satoshi Kawasaki, Hiroshi Ito, Yoshitaka Sekiguchi, Tohru Ono, Masaru Shibasawa
  • Publication number: 20030165761
    Abstract: The present invention relates to toners for full color image-forming machine with specific external additives (kind, BET specific surface area etc.) added externally in combination to toner particles prepared by a wet granulation method, and a fixing method suitable for the toner.
    Type: Application
    Filed: February 28, 2003
    Publication date: September 4, 2003
    Applicant: Minolta Co., Ltd.
    Inventors: Takeshi Arai, Masahiro Anno, Chikara Tsutsui, Minoru Nakamura, Yoshitaka Sekiguchi
  • Publication number: 20030108808
    Abstract: The present invention relates to a toner for developing an electrostatic latent image comprising a binder resin, a colorant, a first wax, and a second wax whose kind is different from that of the first wax, wherein the toner is prepared by a kneading-grinding method and integrated domains of the first wax and the second wax are dispersed in the binder resin.
    Type: Application
    Filed: July 23, 2002
    Publication date: June 12, 2003
    Inventors: Masahide Inoue, Chikara Tsutsui, Yoshihiro Mikuriya, Yoshitaka Sekiguchi, Takeshi Arai, Megumi Aoki, Masahiro Anno
  • Patent number: 6541173
    Abstract: The present invention provide a toner comprising: a coloring agent; a binder resin comprising a first binder resin and a second binder resin, the first binder resin being composed of a linear polyester resin having a number-average molecular weight (Mn) of from 2,500 to 7,000, a weight-average molecular weight (Mw) of from 8,000 to 25,000, and a Mw/Mn ratio of 2 to 4, the second binder resin being composed of a non-linear polyester resin having a number-average molecular weight (Mn) of from 3,500 to 11,000, a weight-average molecular weight (Mw) of from 40,000 to 250,000, and a Mw/Mn ratio of 10 to 35, and a ratio of the first binder resin to the second binder resin (the first binder resin:the second binder resin) being 15:85 to 85:15 by weight, a first releasing agent having a softening point of 55 to 110° C., and a second releasing agent having a softening point of 110 to 160° C.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: April 1, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Kenichi Kido, Masayuki Hagi, Takeshi Arai, Yoshihiro Mikuriya, Megumi Aoki, Yoshitaka Sekiguchi, Tetsuo Sano, Junichi Tamaoki
  • Publication number: 20030047932
    Abstract: A vehicle body rear part structure includes a rectangular support frame carrying thereon a cylindrical fuel tank and attached to left and right rear frames from below via left and right front brackets and left and right rear brackets so as to define therebetween a pair of laterally spaced openings generally corresponding in position to the axis of the fuel tank and receiving therein a pipe system of the fuel tank.
    Type: Application
    Filed: August 28, 2002
    Publication date: March 13, 2003
    Applicant: HONDA GIKEN KOGYO KABUSHIKI KAISHA
    Inventors: Masahiro Kawazu, Hiroshi Osato, Toshiaki Shimizu, Yoshitaka Sekiguchi, Tohru Ono, Masaru Shibasawa
  • Patent number: 6506530
    Abstract: The present invention provide a toner comprising: a coloring agent; a binder resin comprising a first binder resin and a second binder resin, the first binder resin being composed of a linear polyester resin having a number-average molecular weight (Mn) of from 2,800 to 7,000, a weight-average molecular weight (Mw) of from 8,900 to 21,000, and a Mw/Mn ratio of 2 to 4, the second binder resin being composed of a non-linear polyester resin having a number-average molecular weight (Mn) of from 3,500 to 8,000, a weight-average molecular weight (Mw) of from 40,000 to 120,000, and a Mw/Mn ratio of 10 to 20, and a ratio of the first binder resin to the second binder resin (the first binder resin:the second binder resin) being 60:40 to 95:5 by weight.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: January 14, 2003
    Assignee: Minolta Co., Ltd.
    Inventors: Kenichi Kido, Masayuki Hagi, Megumi Aoki, Yoshihiro Mikuriya, Takeshi Arai, Tetsuo Sano, Yoshitaka Sekiguchi, Junichi Tamaoki
  • Patent number: 6482561
    Abstract: The present invention relates to a toner that contains at least a binder resin and a colorant, characterized in that the toner has a temperature range of 90 to 110° C. at 2×103 (Pa) of a storage elastic modulus (G′) under 0.1 (Hz) of a frequency.
    Type: Grant
    Filed: August 25, 2000
    Date of Patent: November 19, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Takeshi Arai, Megumi Aoki, Yoshitaka Sekiguchi, Junichi Tamaoki, Yoshihiro Mikuriya, Tetsuo Sano, Masayuki Hagi, Kenichi Kido
  • Patent number: 6352808
    Abstract: The present invention relates to an additive agent for toner, comprising: inorganic particles; a first fatty-acid metal salt existing on the surface of the inorganic particles, the first fatty acid metal salt having a metal that is an alkali metal; and a second fatty-acid metal salt existing on the surface of the inorganic particles, the second fatty-acid metal salt having a metal other than an alkali metal, a ratio of the first fatty-acid metal salt to the second fatty-acid metal salt being set in a range of 0.01 to 0.5% by weight; and a toner containing toner particles and the additive agent.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: March 5, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Masayuki Hagi, Takeshi Arai, Yoshihiro Mikuriya, Yoshitaka Sekiguchi, Kenichi Kido, Megumi Aoki, Tetsuo Sano, Junichi Tamaoki
  • Patent number: 6338929
    Abstract: The present invention provides a toner for developing an electrostatic latent image which suppresses an adhesion and wearability on a surface of a photosensitive member and exhibits an excellent rising property of an electrification. The toner comprises (i) toner particles containing a binder resin and a colorant, (ii) a first external additive consisting of first inorganic particles whose number-average particle size is 5-40 nm, (iii) a second external additive consisting of second inorganic particles whose number-average particle size, which is larger than that of the first external additive, is 20-160 nm, (iv) a third external additive consisting of third inorganic particles whose number-average particle size, which is larger than that of the second external additive, is 80-1200 nm, and (v) a fourth external additive consisting of a metal salt of fatty acid whose volume-average particle size is 1.5-12 &mgr;m, said four external additives being externally added to the toner particles.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: January 15, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Masayuki Hagi, Yoshihiro Mikuriya, Yoshitaka Sekiguchi, Kenichi Kido, Takeshi Arai, Megumi Aoki, Tetsuo Sano, Junichi Tamaoki
  • Patent number: 6335134
    Abstract: The toner composition comprises an aliphatic higher alcohol (1) or a higher fatty acid (2): H&Parenopenst;CH2&Parenclosest;nOH (n: an integer)  (1) H&Parenopenst;CH2&Parenclosest;mCOOH (m: an integer)  (2) wherein number-average carbon atom numbers of the aliphatic higher alcohol or higher fatty acid ore 21-29, contents of the ingredients having carbon atom numbers of not more than 20 are not more than 2% by weight, and contents of the ingredients having carbon atom numbers of not less than 30 are not more than 2% by weight.
    Type: Grant
    Filed: August 1, 2000
    Date of Patent: January 1, 2002
    Assignee: Minolta Co., Ltd.
    Inventors: Masayuki Hagi, Yoshihiro Mikuriya, Takeshi Arai, Kenichi Kido, Yoshitaka Sekiguchi, Tetsuo Sano, Megumi Aoki, Junichi Tamaoki
  • Patent number: 6025107
    Abstract: The negatively chargeable toner of the present invention comprises negatively chargeable toner particles including a boron compound, and exterior additive particles adhered to the surface of the toner particle and comprising hydrophobic silica particles and metal titanate particles, wherein the additive weight ratio of said hydrophobic silica particles and metal titanate particles is within a range of 5:1 to 1:1.2, and a total specific surface area S of the exterior additive particles is 40 to 120.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: February 15, 2000
    Assignee: Minolta Co., Ltd.
    Inventors: Yoshitaka Sekiguchi, Tetsuo Sano, Kenichi Kido
  • Patent number: 5863694
    Abstract: The present invention relates to a toner for developing a digital-image, comprising particles having rounded surfaces and having the following size distribution:log ?Y!=-0.16 X+k (2.4.ltoreq.k.ltoreq.2.7)5.0.ltoreq.X.ltoreq.11.7 ?.mu.m!wherein ?X! represents an average particle size by volume size and ?Y! represents % by number of particles of not more than 5 .mu.m.
    Type: Grant
    Filed: February 5, 1997
    Date of Patent: January 26, 1999
    Assignee: Minolta Co., Ltd.
    Inventors: Tetsuo Sano, Yoshitaka Sekiguchi, Satoru Iwata, Hiroyuki Fukuda
  • Patent number: 5853940
    Abstract: The present invention relates to a toner comprising a specific binder resin, a specific polyethylene wax and a specific polypropylene wax. The present invention further relates to a toner which comprises a binder resin including a specific first resin and a specific second resin.
    Type: Grant
    Filed: April 27, 1998
    Date of Patent: December 29, 1998
    Assignee: Minolta Co., Ltd.
    Inventors: Kenichi Kido, Tetsuo Sano, Yoshitaka Sekiguchi, Hiroyuki Fukuda