Patents by Inventor Fred K. Kawahara

Fred K. Kawahara 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 the gravimetric determination of oil and grease
    Patent number: 5294553
    Abstract: A non-halogenated solvent mixture for gravimetric determination of grease and oil in an aqueous or a solid matrix comprising a mixture of n-hexane and methyl tertiary-butyl ether present in a volume ratio of 80% to 20% respectively. A method of gravimetric determination of grease and oil in an aqueous or a solid matrix which comprises preparing a sample; extracting the same using this non-halogenated solvent mixture; distilling; evaporating and weighing the extraction residue.
    Type: Grant
    Filed: May 26, 1993
    Date of Patent: March 15, 1994
    Assignee: The United States of America as represented by the Administrator of the Environmental Protection Agency
    Inventor: Fred K. Kawahara