Patents by Inventor Jan-Erik Soderstrom

Jan-Erik Soderstrom 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 of forming tubes or pipes
    Patent number: 4149399
    Abstract: In a method of forming tubes or pipes from a flat blank of a plastically deformable material, three spaced apart portions of the blank are first bent to the wanted curvature of the finished tube or pipe, so that two smaller unbent portions are obtained between the curved portions. Then, the blank is closed to essentially tubular form by means of forces acting on the curved portions, so that the principal deformation in connection with the closing is obtained in the unbent portions located between the curved portions.
    Type: Grant
    Filed: January 9, 1978
    Date of Patent: April 17, 1979
    Assignee: AB Carbox
    Inventors: Hans Persson, Jan-Erik Soderstrom