Patents by Inventor Gregory A. Hatfield

Gregory A. Hatfield 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).

  • Patent number: 4683884
    Abstract: A smokeless, low noise electrosurgical device includes a tubular housing having a passage extending axially therethrough, with one end of the passage connected to a source of negative gauge pressure. The other, inlet end of the housing is provided with an electrosurgical cutting device or cauterizing probe extending therefrom. The inlet to the passage comprises a wide opening having side walls which converge to a relatively narrow port in flow communication with the passage in the housing. The port is significantly narrower than the passage, resulting in significantly reduced noise generated by the fluid flow into the inlet and through the passage.
    Type: Grant
    Filed: April 11, 1986
    Date of Patent: August 4, 1987
    Assignee: MD Engineering
    Inventors: Gregory A. Hatfield, Robert E. Lash