Patents by Inventor Paul Holso

Paul Holso 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 ribbed pipe
    Patent number: 5139730
    Abstract: The invention relates to a method and apparatus for manufacturing ribbed piping, wherein a formable mass in a plastic state is extruded into a substantially cylindrical forming space of a corrugator, the forming space being delimited by forming molds movable in the production direction of the apparatus and having grooves on the inner surface thereof for forming rib flanges. A stationary kernel portion of a mandrel cools the interior surface of the piping and extends beyond the forming space constituted by the forming molds of the corrugator.
    Type: Grant
    Filed: May 2, 1991
    Date of Patent: August 18, 1992
    Assignee: Uponor N.V.
    Inventors: Paul Holso, Eino Holso, Jyri Jarvenkyla, Dieter Scharwachter, Lennart Agren
  • Method and device for extrusion of a double wall plastics pipe
    Patent number: 4933134
    Abstract: Method in extruding a double-walled plastic tube by using plastic materials of different colors for the inner layer and the outer layer, a portion of the material for the inner layer being diverted to form a longitudinal strip of the outer layer on the outside surface of the tube. The invention also relates to an extrusion tool for working the method, wherein an element (21) is provided inside the tool to divert material from a passage (19) for material for the inner layer to a passage (16) for material for the outer layer.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: June 12, 1990
    Assignee: Oy Uponor AB
    Inventors: Jyri Jarvenkyla, Paul Holso
  • Method and device for extrusion of a double wall plastics pipe
    Patent number: 4790975
    Abstract: Method in extruding a double-walled plastic tube by using plastic materials of different colors for the inner layer and the outer layer, a portion of the material for the inner layer being diverted to form a longitudinal strip of the outer layer on the outside surface of the tube. The invention also relates to an extrusion tool for working the method, wherein an element (21) is provided inside the tool to divert material from a passage (19) for material for the inner layer to a passage (16) for material for the outer layer.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: December 13, 1988
    Assignee: Oy Uponor AB
    Inventors: Jyri Jarvenkyla, Paul Holso