Patents by Inventor Jan Siwerstam

Jan Siwerstam 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).

  • Patent number: 4255924
    Abstract: The method and apparatus for producing pipe cleaners each of which comprises two wires which have been twisted into interlocking spirals with fiber elements clamped between the wires. Two primary wires pass through a spinning head and three continuous strands of fibers are wound into spirals covering the wires. Holding wires are passed against the spiral strands upon opposite sides as the entire assembly moves between a pair of pulleys. As the assembly emerges, the fibers are cut diametrically of the spirals to form two continuous rows of fiber elements. Each row is clamped to its adjacent primary wire by a holding wire thus to form a workpiece. Each workpiece passes through a transfer assembly in which the row of fiber elements is clamped to a pulley by one of the wires while the other wire passes along a free loop around pulley and thence back to the row of fiber elements in the wire holding them.
    Type: Grant
    Filed: July 27, 1979
    Date of Patent: March 17, 1981
    Assignee: United States Tobacco Company
    Inventor: Jan Siwerstam