Patents by Inventor Maria Sakairi

Maria Sakairi 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).

  • Metal indicator
    Patent number: 7648839
    Abstract: To provide a novel copper ion indicator which is less influenced by interfering metal ions and which is useful for measurement of copper ion within a wide concentration range. The invention provides a copper ion indicator containing a compound represented by formula (1): [wherein each of R1, R2, R3, R4, R5, and R6 represents a hydrogen atom or an alkali metal atom], and a method for determining copper ion concentration, which employs the indicator.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: January 19, 2010
    Assignee: Kowa Co., Ltd.
    Inventors: Maria Sakairi, Katsumi Yabusaki
  • Metal Indicator
    Publication number: 20080057591
    Abstract: To provide a novel copper ion indicator which is less influenced by interfering metal ions and which is useful for measurement of copper ion within a wide concentration range. The invention provides a copper ion indicator containing a compound represented by formula (1): [wherein each of R1, R2, R3, R4, R5, and R6 represents a hydrogen atom or an alkali metal atom], and a method for determining copper ion concentration, which employs the indicator.
    Type: Application
    Filed: June 21, 2005
    Publication date: March 6, 2008
    Applicant: Kowa Co., Ltd.
    Inventors: Maria Sakairi, Katsumi Yabusaki