Patents by Inventor Keith D. Murphy

Keith D. Murphy 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).

  • Noise reduction system for a rotary positive blower
    Patent number: 5950273
    Abstract: A rotary positive blower is driven by a drive device and has an intake port and an exhaust port. A plurality of conduit arrangements each having an inlet coupled to the exhaust port and an outlet, each of the plurality of conduit arrangements have a first predetermined diameter in at least a given portion; and a restriction is disposed in at least one of the plurality of conduit arrangements between the inlet and the outlet of this at least one arrangement, the restriction has a predetermined length and a second predetermined diameter less than the first predetermined diameter to cooperate in reduction of noise and improved efficiency of the drive device and the rotary positive blower.
    Type: Grant
    Filed: September 22, 1997
    Date of Patent: September 14, 1999
    Inventors: Theodore Suhaka, Keith D. Murphy