Patents by Inventor Dilyard Doolin

Dilyard Doolin 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).

  • Engine noise reducer
    Patent number: 5025889
    Abstract: A noise reducer for an engine induction system comprises an outer duct having an inlet and outlet, and an inner duct having an inlet and outlet. The inner duct has a contained portion including the inner duct outlet and a portion of the inner duct adjacent to the inner duct outlet. The contained portion is contained in the outer duct with the inner duct outlet being adjacent the outer duct outlet. The noise reducer further comprises a closure extending away from the inner duct into engagement with the outer duct. The closure is spaced apart from the inner duct outlet along the axis of the inner duct. A resonance chamber is defined by the space between the contained portion, closure and outer duct. A chamber port is defined by the space between the inner duct outlet and the outer duct.
    Type: Grant
    Filed: August 25, 1989
    Date of Patent: June 25, 1991
    Assignee: General Motors Corporation
    Inventors: Alan R. Lockwood, Sidney C. Kolongowski, Dilyard Doolin