Patents by Inventor Charles P. Stahl

Charles P. Stahl 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).

  • Shear force measurement device for beds and method
    Patent number: 6131469
    Abstract: The present invention is a device to measure the parallel shear force on a mattress. The device has a motor, a weighted object, a high friction material pad, and a load cell. The motor moves by pushing and pulling the weighted object on the high friction material pad which is on the mattress. The load cell measures the peak shear force when the weighted object is pulled and when the weighted object is pushed.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: October 17, 2000
    Assignee: Gaymar Industries, Inc.
    Inventors: Ronald D. Wortman, Michael P. Rechin, Charles P. Stahl