Patents by Inventor David C. Yoder

David C. Yoder 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).

  • Plunger for a control valve of a servomotor
    Patent number: 4970939
    Abstract: A plunger (52) having a cylindrical body with a smooth surface (61) thereon which joins an semi-spherical atmospheric seat (62) with a conical surface (60) to define with a section (31) of bore (30) a flow path through which air is communicated from the environment to a rear chamber (20) without the creation of noise. The smooth surface (61) is made of a porous material (51) that absorbs sounds without substantially effecting the flow of air.
    Type: Grant
    Filed: August 31, 1989
    Date of Patent: November 20, 1990
    Assignee: Allied-Signal Inc.
    Inventors: Douglas A. Fecher, David C. Yoder