Patents by Inventor David A. Crews

David A. Crews 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).

  • Prophylactic for laryngoscope
    Patent number: D379504
    Type: Grant
    Filed: September 24, 1992
    Date of Patent: May 27, 1997
    Inventors: David A. Crews, Kay R. Huffstetler