Patents by Inventor Mikio Kohyama

Mikio Kohyama 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: 6475689
    Abstract: A toner for developing electrostatic latent image is disclosed. The toner comprise of particles having a volume average particle diameter of from 3 to 8 &mgr;m, and said resin is obtained by either emulsion polymerization, mini-emulsion polymerization employing or suspension polymerization employing thioglycerin or at least one compound selected from compounds represented by the Formula (1) as the chain transfer agent. HS—R1—COOR2  (1) In the formula, R1 is an aliphatic group having carbon atoms from 1 to 10, which may have a substituent, and R2 is an aliphatic group having carbon atoms from 1 to 15, which may have a substituent.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: November 5, 2002
    Assignee: Konica Corporation
    Inventors: Hiroshi Yamazaki, Kenji Yamane, Hiroyuki Kozuru, Kenji Hayashi, Mikio Kohyama
  • Patent number: 6475685
    Abstract: A toner for developing electrostatic latent image is disclosed. The toner comprises a crystalline compound, and exhibits at least one recrystallization peak during the second heating process in the DSC curve of said toner. An image forming method employing the toner is also disclosed.
    Type: Grant
    Filed: February 26, 2001
    Date of Patent: November 5, 2002
    Assignee: Konica Corporation
    Inventors: Masafumi Uchida, Tsuyoshi Uchida, Mikio Kohyama, Kenji Hayashi
  • Patent number: 6472117
    Abstract: A toner for developing an electrostatic image comprising a resin, a colorant and a releasing agent in which the toner particles are obtained by salting out/fusion-adhering a resin particle comprising a binding resin and a releasing agent together with a colorant particle is disclosed. The toner comprises the toner particles having a variation coefficient of not more than 16% and a number variation coefficient of the number particle size distribution of not more than 27%.
    Type: Grant
    Filed: July 19, 2001
    Date of Patent: October 29, 2002
    Assignee: Konica Corporation
    Inventors: Mikio Kohyama, Kenji Hayashi, Masafumi Uchida, Tsuyoshi Uchida, Hiroyuki Yamada
  • Publication number: 20020037469
    Abstract: A toner for developing an electrostatic image comprising a resin, a colorant and a releasing agent in which the toner particles are obtained by salting out/fusion-adhering a resin particle comprising a binding resin and a releasing agent together with a colorant particle is disclosed. The toner comprises the toner particles having a variation coefficient of not more than 16% and a number variation coefficient of the number particle size distribution of not more than 27%.
    Type: Application
    Filed: July 19, 2001
    Publication date: March 28, 2002
    Inventors: Mikio Kohyama, Kenji Hayashi, Masafumi Uchida, Tsuyoshi Uchida, Hiroyuki Yamada
  • Publication number: 20020034703
    Abstract: A toner for developing electrostatic latent image is disclosed. The toner comprise of particles having a volume average particle diameter of from 3 to 8 &mgr;m, and said resin is obtained by either emulsion polymerization, mini-emulsion polymerization employing or suspension polymerization employing thioglycerin or at least one compound selected from compounds represented by the Formula (1) as the chain transfer agent.
    Type: Application
    Filed: July 17, 2001
    Publication date: March 21, 2002
    Inventors: Hiroshi Yamazaki, Kenji Yamane, Hiroyuki Kozuru, Kenji Hayashi, Mikio Kohyama
  • Publication number: 20010026899
    Abstract: A toner for developing electrostatic latent image is disclosed. The toner comprises a crystalline compound, and exhibits at least one recrystallization peak during the second heating process in the DSC curve of said toner. An image forming method employing the toner is also disclosed.
    Type: Application
    Filed: February 26, 2001
    Publication date: October 4, 2001
    Inventors: Masafumi Uchida, Tsuyoshi Uchida, Mikio Kohyama, Kenji Hayashi
  • Patent number: 6255029
    Abstract: A process for preparing a color toner for developing an electrostatic image comprising a step of polymerizing monomers to obtain resin particles, wherein the color toner comprises primary particles or secondary particles of resin particles, and a metal complex dye represented by the following formula (1) or formula (2), wherein, X1 and X3 each are a group of atoms bonding with each other which can form at least bidentate coordination bond with a metal ion; Y1 represents an aromatic hydrocarbon ring, a 5- or 6-membered heterocyclic ring or —L4═Y2; Y2 and Y3 each represent an aromatic hydrocarbon ring or a 5- or 6-membered heterocyclic ring; L1 and L4 each represent a substituted or an unsubstituted methine group or a nitrogen atom; L2 and L3 each represent a substituted or an unsubstituted methine group; M represents a metal ion which can form at least a bidentate coordination bond with said group of atoms bonding with each other represented by X1 and X3; m represents an integer of
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: July 3, 2001
    Assignee: Konica Corporation
    Inventors: Naohiro Hirose, Mikio Kohyama, Kenji Hayashi, Tomoe Kitani, Yoshiki Nishimori
  • Patent number: 6033820
    Abstract: A toner for developing an electrostatic image is disclosed. The toner is composed of association of a plurality of fine polymer particles, and the total volume of pores having a diameter of not more than 0.1 .mu.m on the toner surfaces is not more than 30 percent of the total toner volume. An image forming method employing the same is also disclosed. A toner which does not result in an unstable charge amount over an extended period of use can be obtained.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: March 7, 2000
    Assignee: Konica Corporation
    Inventors: Kenji Hayashi, Naohiro Hirose, Yoshiki Nishimori, Tomoe Kitani, Mikio Kohyama
  • Patent number: 5888686
    Abstract: Disclosed is a toner for developing an electrostatic latent image, the toner containing polymer particles having a carboxyl group on the surface thereof in the range of5.times.10.sup.-11 mol/cm.sup.2 .ltoreq.A.ltoreq.3.times.10.sup.-9 mol/cm.sup.2wherein A represents an amount of the carboxyl group obtained using a conductometric titration method.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: March 30, 1999
    Assignee: Konica Corporation
    Inventors: Naohiro Hirose, Tomoe Kikuchi, Kenji Hayashi, Yoshiki Nishimori, Mikio Kohyama
  • Patent number: 5863691
    Abstract: Disclosed is a toner for developing an electrostatic latent image, comprising colored particles containing a colorant and a binder resin, and hydrophobic particles, wherein said colored particles have a BET specific surface area of not less than 5 m.sup.2 /g and said hydrophobic particles satisfy the following relation:.vertline.pH.sub.A -pH.sub.B .vertline..ltoreq.1.0wherein said pH.sub.A is a pH value of said hydrophobic particles before heating and said pH.sub.B is a pH value of said hydrophobic particles after heating.
    Type: Grant
    Filed: June 24, 1997
    Date of Patent: January 26, 1999
    Assignee: Konica Corporation
    Inventors: Hiroshi Yamazaki, Shigenori Kouno, Michiaki Ishikawa, Mikio Kohyama