Patents by Inventor Tadashi Iihara

Tadashi Iihara 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).

  • Dispersant comprising indane ring containing polystyrenesulfonic acid compounds
    Patent number: 6197893
    Abstract: A dispersant comprises a polystyrenesulfonic acid having a weight-average molecular weight in the range of 2,000 to 100,000 or a salt thereof, wherein at least 70% of the terminals of the polymer chain have an indane ring of the formula (I): wherein X represents a cation selected from the group consisting of a hydrogen, alkali metals, alkaline earth metals, ammonium and organic amines, and n and m each represent 0 or an integer of at least 1. The dispersant has excellent properties of dispersing organic and inorganic substances and an effect of remarkably improving the stability of a dispersion system such as a coal/water slurry.
    Type: Grant
    Filed: April 20, 1994
    Date of Patent: March 6, 2001
    Assignee: Lion Corporation
    Inventors: Junichi Yamada, Mituo Sugiyama, Tadashi Iihara
  • Method for dispersing and stabilizing a coal/water slurry using a polystyrenesulfonate
    Patent number: 5328491
    Abstract: A dispersant comprises a polystyrenesulfonic acid having a weight-average molecular weight in the range of 2,000 to 100,000 or a salt thereof, wherein at least 70% of the terminals of the polymer chain have an indane ring of the formula (I): ##STR1## wherein X represents a cation selected from the group consisting of a hydrogen, alkali metals, alkaline earth metals, ammonium and organic amines, and n and m each represent 0 or an integer of at least 1. The dispersant has excellent properties of dispersing organic and inorganic substances and an effect of remarkably improving the stability of a dispersion system such as a coal/water slurry.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: July 12, 1994
    Assignee: Lion Corporation
    Inventors: Junichi Yamada, Mituo Sugiyama, Tadashi Iihara