Patents by Inventor Riro Kobayashi

Riro Kobayashi 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).

  • Process for purifying niobium alkoxides and tantalum alkoxides
    Patent number: 5919963
    Abstract: A process, excellent in the mass productivity and economization, for purifying a niobium alkoxide or tantalum alkoxide containing Fe, Ca, Sr, Na, U, etc. as impurities to attain a purity necessitated for electronic materials or the like is provided. A niobium alkoxide or tantalum alkoxide containing the above-described impurities is dissolved in a solvent to obtain a solution, 1 to 20% of the alkoxide in the solution is hydrolyzed under stirring to form a solid reaction product, and the reaction product is separated from the unreacted alkoxide by the distillation to recover the alkoxide.
    Type: Grant
    Filed: September 17, 1997
    Date of Patent: July 6, 1999
    Assignee: Kabushikikaisha Kojundokagaku Kenkyusho
    Inventors: Yuukou Hochido, deceased, Hidekimi Kadokura, Shuzo Tanabe, Riro Kobayashi