Patents by Inventor Robert N. Cawood

Robert N. Cawood 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).

  • Constant force spring expandable clasp-holder
    Patent number: 4135626
    Abstract: The specification discloses a holding device which applies a constant force to the objects held regardless of their size or number. All embodiments utilize a constant force spring which is coiled at opposite ends.
    Type: Grant
    Filed: September 17, 1976
    Date of Patent: January 23, 1979
    Inventor: Robert N. Cawood