Patents by Inventor Henry A. Kumasaka

Henry A. Kumasaka 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).

  • Jet engine noise suppressor
    Patent number: 4979587
    Abstract: A compressor bleed air passageway includes a duct having an upstream section (48) which terminates in a baffle (44) and a downstream duct section (54) having a forward portion (56) which surrounds the baffle (44). Bleed air flow through openings (58) in the baffle wall (52). This reduces velocity of the bleed air stream at the duct discharge port to a value equal to or less than Mach 1.0. The baffle (44) has virtually no effect on a low-velocity, low-pressure air stream. The downstream duct section (54) may be perforated and surrounded by outer wall (64) to form sound-absorbing chambers (66).
    Type: Grant
    Filed: August 1, 1989
    Date of Patent: December 25, 1990
    Assignee: The Boeing Company
    Inventors: William J. Hirt, Jack H. Caldwell, Claude R. Stachowiak, Ira B. Rushwald, Henry A. Kumasaka