Patents by Inventor Dirk Arts

Dirk Arts 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).

  • Sleeve joint and method of producing such a sleeve joint
    Patent number: 4807910
    Abstract: A sleeve joint for plastic-sheathed insulated pipes, comprising an oversized joint sleeve of plastic material overlapping the ends of the sheaths of connected pipes with a gap provided between the sleeve and said ends. Spacer means are located in the gap at either end. A circumferential groove is provided in the respective sheath outside of the gap. A fillet weld of a plastic material fills up the groove and the gap opening, and covers the sleeve end face.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: February 28, 1989
    Assignee: Oy Uponor AB
    Inventors: Goran Johansson, Dirk Arts