Patents by Inventor Mark C. Esbenson

Mark C. Esbenson 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).

  • Pistachio nut opener
    Patent number: 5339524
    Abstract: A nut opener comprises a wire formed into a coiled spring with lever arms extending from opposite sides of the spring and terminating in pointed extremities in the form of knife edges which are insertable into the opening between half shells of the nut and, when the arm members are manually squeezed, will spread the pointed extremities to open the shell.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: August 23, 1994
    Inventors: Kenneth C. Sawyer, III, Mark C. Esbenson