Patents by Inventor Dag Thulin

Dag Thulin 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 for producing ends of metal of composite pipe lengths
    Patent number: 6478921
    Abstract: The invention relates to a method for producing ends of metal of composite pipes, comprising a casing pipe (1) of metal and a load carrying sheath (6, 7) of reinforced plastics, which sheath is produced in that the reinforcement is filled with polymer through injection under vacuum through injection pipes, said reinforcement comprises a first reinforcement layer (6) and a second reinforcement layer (7).
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: November 12, 2002
    Inventor: Dag Thulin
  • Method for vacuum molding of large objects of synthetic resin
    Patent number: 5328656
    Abstract: A method for vacuum molding of large objects in a dismountable mold. The method includes the steps of introducing a monomer and a hardening agent to a cavity within a mold, with the cavity being under a vacuum. The monomer and hardening agent are introduced at least at one position in the cavity. The position being situated initially in the lower portion of the cavity. The position is successively moved upward at such a speed that the position is located just below the surface of the monomer and hardening agent as they are introduced into the cavity and their level rises within the cavity.
    Type: Grant
    Filed: December 2, 1992
    Date of Patent: July 12, 1994
    Inventor: Dag Thulin