Patents by Inventor Thomas D. Hart

Thomas D. Hart 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).

  • Single spring double lockblade folding knife
    Patent number: 4302877
    Abstract: A foldable knife is provided having two lock blades each of which or both of which simultaneously may be locked in their open position against movement in either direction about their respective pivots. A separate locking member and tumbler is provided for each blade but only a single spring is utilized to operate both locking members and urge them toward their locked position.
    Type: Grant
    Filed: May 12, 1980
    Date of Patent: December 1, 1981
    Assignee: W. R. Case & Sons Cutlery Company
    Inventors: Thomas D. Hart, David J. Hart