Patents by Inventor Frank B. Griswold

Frank B. Griswold 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: 4231170
    Abstract: A safety shoe instep guard of compound curvature conforming generally to the shape of the human instep is constructed as an integral part of the shoe or secured to the shoe adjacent at least the lower end of the guard and extends upwardly from the region of the toes. The guard includes a plurality of elongated generally arched-shaped rigid strips extending transversely of the instep and are articulated together in overlapping relation to provide an armored protector assembly having sufficient flexibility to permit normal use and movement of the shoe. The articulated rigid strips are provided with an upwardly directed, generally arcuate arch extending transversely of the individual strips, with the arcuate arches of adjacent rigid strips overlapping and cooperating to form a continuous upwardly directed reinforcing ridge extending substantially the full length of the articulated armor assembly.
    Type: Grant
    Filed: February 2, 1979
    Date of Patent: November 4, 1980
    Inventor: Frank B. Griswold