Patents by Inventor Jun Umemoto

Jun Umemoto 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).

  • Quantitative determination method for chloride ions
    Patent number: 5962248
    Abstract: Chloride ion is quantitatively determined in a sample by adding to the sample an enzyme having glucokinase activity to thereby eliminate glucose, admixing an .alpha.-amylase which has been deactivated by a chelating agent, and reacting the .alpha.-amylase with maltotetraose, maltohexaose or maltoheptaose.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: October 5, 1999
    Assignee: Kyowa Medex Co., Ltd.
    Inventors: Toshio Tadano, Norihiko Kayahara, Jun Umemoto
  • Method for measurement of ionized calcium
    Patent number: 5840512
    Abstract: The present invention relates to a method for quantitatively determining ionized calcium in a sample by using a phospholipase, which comprises carrying out an enzyme reaction with the phospholipase in a buffer comprising a nitrogen heterocycle-binding sulfonic acid having a pK ranging 6.6 to 7.6 or a salt thereof.According to the method of the invention, the amount of ionized calcium in a sample, such as serum, can be accurately determined.
    Type: Grant
    Filed: April 3, 1996
    Date of Patent: November 24, 1998
    Assignee: Kyowa Medex Co., Ltd.
    Inventors: Toshio Tadano, Akira Miike, Norihiko Kayahara, Jun Umemoto
  • Quantitative determination method for sodium ions
    Patent number: 5700652
    Abstract: The present invention relates to a method for quantitatively determining sodium ions in a sample using .beta.-galactosidase in an aqueous medium, wherein a .beta.-galactosidase reaction is carried out in the presence of a cation which competes with the sodium ion.The method of the present invention is good in accurate determination and reproducibility and enables the simple and quick quantitative determination of sodium ions.
    Type: Grant
    Filed: November 29, 1995
    Date of Patent: December 23, 1997
    Assignee: Kyowa Medex Co., Ltd.
    Inventors: Toshio Tadano, Akira Miike, Jun Umemoto