Patents by Inventor Yoichi Miyamoto

Yoichi Miyamoto 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).

  • Method for treating hypertension using pyrazolopyrimidine derivatives
    Patent number: 5747495
    Abstract: Antihypertensive agents containing as its active ingredient the 4-amino-6-hydroxypyrazolo ?3,4-d!pyrimidine(AHPP) or its derivatives represented by the general formula (I) below. ##STR1## where R is hydrogen atom, alkyl group or aryl group.AHPP can be chemically synthesized by a reaction of 3-amino-4-cyanopyrazole and urea.The antihypertensive agents of the present invention show a mild and reliable blood pressure lowering activity, and have a different mode of action from currently available antihypertensive agents.
    Type: Grant
    Filed: August 21, 1996
    Date of Patent: May 5, 1998
    Assignee: Hiroshi Maeda
    Inventors: Hiroshi Maeda, Takaaki Akaike, Yoichi Miyamoto, Masaki Yoshida
  • Process for treatment of radioactive waste
    Patent number: 5744020
    Abstract: A process for treating a radioactive waste, includes drying a radioactive waste containing a radioactive substance(s) and a sodium compound(s), to convert it into a dried material, heating the dried material to convert it into a molten salt, and subjecting the molten salt to electrolysis using the salt as an anolyte and .beta.-alumina as a sodium ion-permeable membrane. This process can recover metallic sodium or sodium hydroxide, each of extremely low radioactivity from a radioactive waste containing a radioactive substance(s) and a sodium compound(s), at a high purity at a high current efficiency.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: April 28, 1998
    Assignees: Douryokuro Kakunenryo Kaihatsu Jigyoudan, NGK Insulators, Ltd.
    Inventors: Takao Akiyama, Yoichi Miyamoto, Shunji Inoue, Yoshihiko Kurashima, Yoichi Karita
  • 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide derivatives and their use as therapeutic agents for maintaining blood pressure
    Patent number: 5464857
    Abstract: (1) The imidazoline derivative represented by the following general formula (1) ##STR1## where R.sup.1 is a substituent endowed with water solubility or fat solubility, particularly carboxyl group or carboxymethoxy group or a pharmaceutically acceptable salt thereof, (2) The method for producing the above-mentioned compound, and (3) A therapeutic agent containing as its active ingredient the above-mentioned imidazoline derivative or an imidazoline derivative wherein R.sup.1 indicated in the formula (1) is hydrogen atom. The imidazoline derivative set forth under (1) above is a novel substance; and this compound itself and its derivative having R.sup.1 as indicated in the general formula (1) is hydrogen atom are useful as a therapeutic agent for treatment of shock from the fall in blood pressure by virtue of their ability to remove excess NO which is the vascular endothelium-derived relaxing factor (EDRF).
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: November 7, 1995
    Assignee: Hiroshi Maeda
    Inventors: Hiroshi Maeda, Yoichi Miyamoto, Takaaki Akaike