Patents by Inventor David E. Schaefer

David E. Schaefer 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).

  • Vibration balanced receiver
    Publication number: 20010012375
    Abstract: A balanced receiver providing significantly reduced vibration is disclosed. The balanced receiver comprises a closed loop operably attached between an armature and a diaphragm. The effective moving mass of the diaphragm is designed to match the effective moving mass of the armature. The closed loop facilitates the balancing of the motion of the diaphragm and the motion of the armature, thus reducing the vibration of the receiver.
    Type: Application
    Filed: January 5, 2001
    Publication date: August 9, 2001
    Inventors: Thomas Miller, August Mostardo, Elmer Carlson, David E. Schaefer