Patents by Inventor Warren Dean Knowles

Warren Dean Knowles 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).

  • Tension disc assembly
    Patent number: 4092939
    Abstract: A tension disc assembly for tension devices, used for controlling thread on sewing machines, which is formed with a relatively large supporting frame into which a hardened tension disc is secured. The supporting frame allows the use of a standard-sized tension disc while serving as a guide for threading single and multi thread tension devices.
    Type: Grant
    Filed: December 27, 1976
    Date of Patent: June 6, 1978
    Assignee: The Singer Company
    Inventor: Warren Dean Knowles