Patents by Inventor James N. Ruddell

James N. Ruddell 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).

  • Apparatus for thermally treating tape
    Patent number: 4861249
    Abstract: Machined steel blocks 1 and 2 have ridges 20 facing valleys in the opposite block. Polypropylene tape 3 to be heat-treated has sliding contact transversely over each ridge on each block. The blocks are heated by heaters 4. The gap between the blocks is adjustable to suit the material being processed. The gap is large enough so that the tape passing between the blocks is not constrained to deflect from coplanarity by more than its own thickness.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: August 29, 1989
    Assignee: National Research Development Corporation
    Inventor: James N. Ruddell