Patents by Inventor Edward F. Leftwich

Edward F. Leftwich 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).

  • Adjustable stepping structure for aerobic exercises
    Patent number: 5158512
    Abstract: An adjustable stepping structure for aerobic exercises comprising a platform upon which the participant places his or her feet, the platform being elevated above a support surface by means of one or more support elements which are capable of being detachably stacked upon each other until the platform is maintained at a selected distance above the support surface, depending upon the skill and physical characteristics of the participant.
    Type: Grant
    Filed: September 20, 1991
    Date of Patent: October 27, 1992
    Assignee: Sports Step, Inc.
    Inventors: Lyle R. Irwin, Peter H. Hand, Edward F. Leftwich