Patents by Inventor Martin W. Johnson

Martin W. Johnson 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).

  • Abdominal exercise device
    Patent number: 5071119
    Abstract: An exercise device for exercising abdominal muscles and lower back muscles without putting undue stress on lumbar and cervical spinal discs and without over-exercising the hip flexor muscles is for use by a person sitting on a chair. The device includes a pushbar supported on a vertical column including a compression spring means. This column is supported on the floor. The person exercising sits with his or her chin at the height of a horizontally positioned pushbar, puts his or her arms over the pushbar and performs a trunk curl against the resistive force of the spring. The exerciser curls his trunk against the resistive force, holds it for a second, twists to the right and left, and then very slowly allows the resistive force to push the trunk upward to resume the original upright position.
    Type: Grant
    Filed: December 3, 1990
    Date of Patent: December 10, 1991
    Inventor: Martin W. Johnson
  • Abdominal exerciser for attachment to chair or the like
    Patent number: D274173
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: June 5, 1984
    Inventor: Martin W. Johnson
  • Physical exerciser
    Patent number: D275213
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: August 21, 1984
    Inventor: Martin W. Johnson
  • Abdominal exercise bench
    Patent number: D277219
    Type: Grant
    Filed: September 29, 1982
    Date of Patent: January 15, 1985
    Inventor: Martin W. Johnson
  • Abdominal exerciser for attachment to chair or the like
    Patent number: D277497
    Type: Grant
    Filed: November 1, 1982
    Date of Patent: February 5, 1985
    Inventor: Martin W. Johnson