Patents by Inventor Shirou Yamamiya

Shirou Yamamiya 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).

  • Near-infrared transmitting black azo pigments
    Patent number: 6623556
    Abstract: Near-infrared transmitting black azo pigments are represented by the following formula (1) and have a crystalline form selected from the group consisting of a thin, long crystalline form and a leaf-shaped crystalline form: wherein R represents at least one group selected from the group consisting of lower alkyl groups having 1 to 3 carbon atoms and lower alkoxy groups having 1 to 3 carbon atoms, n stands for an integer of from 1 to 5, and, when n is other than 1, Rs may be the same or different. These near-infrared transmitting black azo pigments can be produced by treating the corresponding black azo pigments of the formula (1) with an alkali in an alcohol. Near-infrared transmitting black azo pigments compositions each comprises one or more of the near-infrared transmitting black azo pigments and a near-infrared transmitting material as a vehicle.
    Type: Grant
    Filed: December 26, 2001
    Date of Patent: September 23, 2003
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Yoshiyuki Zama, Hisao Okamoto, Hiromitsu Yanagimoto, Shirou Yamamiya, Yoshio Abe, Michiei Nakamura
  • Pigment dispersants and pigment compositions containing the same
    Patent number: 6471766
    Abstract: Pigment dispersants comprise compounds represented by the following formula (I) or (II) or metal, ammonium or amine salts thereof: wherein X1 is a hydrogen or halogen atom or an alkyl or acylamino group, Y1 is an anthraquinonylamino, phenylamino, naphthyl-amino or phenoxy group, each of R1 and R3 is a hydrogen atom or a substituted or unsubstituted alkyl or phenyl group, R2 is a substituted or unsubstituted alkylene, phenylene or naphthylene group, X2 is a hydrogen or halogen atom or a substituted or unsubstituted alkyl group, R4 is a substituted or unsubstituted phenyl or naphthyl group, and n means an average number of sulfonic acid groups introduced in said compound and stands for a number of from 0.5 to 2. Pigment compositions, such as colorants for gravure inks, paints or color filters, comprise pigments and the pigment dispersants.
    Type: Grant
    Filed: January 16, 2001
    Date of Patent: October 29, 2002
    Assignee: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Shigeru Ohki, Takayuki Soga, Kazutaka Aoki, Shotoku Takami, Hisao Okamoto, Hiroaki Saikatsu, Shirou Yamamiya
  • Near-infrared transmitting black azo pigments
    Publication number: 20020121228
    Abstract: Near-infrared transmitting black azo pigments are represented by the following formula (1) and have a crystalline form selected from the group consisting of a thin, long crystalline form and a leaf-shaped crystalline form.
    Type: Application
    Filed: December 26, 2001
    Publication date: September 5, 2002
    Applicant: Dainichiseika Color & Chem. Mfg. Co., Ltd.
    Inventors: Yoshiyuki Zama, Hisao Okamoto, Hiromitsu Yanagimoto, Shirou Yamamiya, Yoshio Abe, Michiei Nakamura
  • Pigment dispersants and pigment compositions containing the same
    Publication number: 20010013303
    Abstract: Pigment dispersants comprise compounds represented by the following formula (I) or (II) or metal, ammonium or amine salts thereof: 1 2
    Type: Application
    Filed: January 16, 2001
    Publication date: August 16, 2001
    Applicant: Dainichiseika Color & Chemicals Mfg. Co., Ltd.
    Inventors: Shigeru Ohki, Takayuki Soga, Kazutaka Aoki, Shotoku Takami, Hisao Okamoto, Hiroaki Saikatsu, Shirou Yamamiya