Patents by Inventor Hidenobu Sawa

Hidenobu Sawa 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).

  • Apparatus for testing membrane filter integrity
    Patent number: 5353630
    Abstract: A membrane filter integrity test system includes a large volume mass-flow controller for rapidly supplying a larger amount of fluid to a primary side of a membrane filter under test, a small volume mass-flow controller for supplying a relatively small amount of fluid to the primary side of the membrane filter. The operation of the large volume mass-flow controller is stopped when the pressure at the primary side of said membrane filter reaches a predetermined level. This predetermined pressure is detected by a pressure sensor which senses the pressure at the primary side of the membrane filter. The pressure sensor responsively generates a detection signal corresponding to the sensed pressure at the primary side of the membrane filter.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: October 11, 1994
    Assignees: Memtec Japan Limited, Filtec Corporation
    Inventors: Fusao Soda, Hidenobu Sawa