Patents by Inventor Donald A. Perser

Donald A. Perser 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: 4459980
    Abstract: The invention disclosed herein is an ankle and foot brace adjustable readily to fit numerous sizes of shoes and legs, the brace includes a pair of spaced leg members, each leg member having means for adjusting the length of the leg member; an adjustable calf attachment means is cooperatively carried by each of the leg members adjacent to the upper ends thereof and extends in use about the wearer's calf for respectively securing the leg members thereto; a bias means on the other end of each leg member to provide dorsiflexion assistance to the wearer's shoes by an adjustable clamping means carried by the leg members adjacent to the lower ends thereof and attaching in use about the wearer's shoe for securing the leg member thereto.
    Type: Grant
    Filed: June 18, 1982
    Date of Patent: July 17, 1984
    Assignee: Ballert Orthopedic Corporation
    Inventors: Donald A. Perser, Erich W. Mohn
  • Patent number: 4176459
    Abstract: The present invention relates to a measuring device for measuring the relative-correctable difference in length of a person's legs in order to determine the amount of elevation required in the construction of an orthopedic shoe to compensate for such difference. The measuring device includes a base plate of predetermined thickness and a sole plate of predetermined thickness, the sole plate having a plan configuration similar to the base plate. Means are provided for preventing relative movement of the sole plate and the base plate, and means for securing the base plate and the sole plate to the foot of the associated person is provided whereby such person can stand and walk on the measuring device. Additional measuring plates of predetermined thickness are provided for increasing the elevation of the measuring device in predetermined increments whereby the correctable difference in elevation of the associated person's leg can be determined.
    Type: Grant
    Filed: April 3, 1975
    Date of Patent: December 4, 1979
    Assignee: Ballert Orthopedic Corp.
    Inventors: Donald A. Perser, Donald A. Roman
  • Patent number: D244886
    Type: Grant
    Filed: September 15, 1975
    Date of Patent: July 5, 1977
    Assignee: Ballert Orthopedic Corp.
    Inventors: Donald A. Perser, Michael F. H. Cook