Patents by Inventor Voitto Vaisanen

Voitto Vaisanen 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).

  • Method and apparatus for manufacturing the socket portion of a plastic pipe
    Patent number: 4386045
    Abstract: A method and an apparatus for manufacturing the socket portion of a plastics pipe provided with a sealing ring by pushing said sealing ring on a mandrel and by locking it thereto whereupon the heated end of said plastics pipe is pushed onto said mandrel and said sealing ring. Hereafter, the locking of said sealing ring is released, and the pipe and the ring therein a removed from the mandrel.In order to facilitate this removal operation, a mandrel having an adjustable diameter is used, the mantle surface of said mandrel being provided with peripheral grooves into which shoulders in said sealing ring fit for locking said ring to said mandrel for the duration of the socket forming.
    Type: Grant
    Filed: May 27, 1981
    Date of Patent: May 31, 1983
    Assignee: Asko Oy
    Inventor: Voitto Vaisanen