Patents by Inventor Irving L. Mark

Irving L. Mark 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).

  • Crutch design
    Patent number: 4852597
    Abstract: A crutch having a telescoping section for adjusting its length. The length of the telescoping section is locked by a pair of detents on the inner telescoping tube popping through selected ones of many periodically recurring confronting holes formed in the outer telescoping tube. The upper and lower ends of the outer one of the telescoping tubes are riveted to spaced parallel upright members which form the weight carrying part of the crutch. The lower rivets to do not pass through the entire diameter of the telescoping section. Instead, heads of the rivets form bosses projecting radially inward from diagonally opposed points on the internal perimeter of the outer telescoping tube.
    Type: Grant
    Filed: March 24, 1987
    Date of Patent: August 1, 1989
    Assignee: Medline Industries, Inc.
    Inventors: Irving L. Mark, Varun Soni
  • Portable grill
    Patent number: D254119
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: February 5, 1980
    Assignee: Mark Design Ltd.
    Inventor: Irving L. Mark
  • Chair
    Patent number: D256744
    Type: Grant
    Filed: November 25, 1977
    Date of Patent: September 9, 1980
    Inventor: Irving L. Mark
  • Steak knife
    Patent number: D291764
    Type: Grant
    Filed: January 24, 1985
    Date of Patent: September 8, 1987
    Assignee: Tip Top Corporation
    Inventor: Irving L. Mark