Patents by Inventor Ulrich Petersen

Ulrich Petersen 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).

  • Making seamless steel pipes
    Patent number: 4809423
    Abstract: A method of forming seamless metal tubing and pipes of large diameter in excess of 500 mm diameter. A thickwalled hollow body is made by continuous casting. Rolling the continuously cast hollow body over a mandrel in an oblique rolling mill to the desired weight per unit length. Radially expanding the rolled hollow body while maintaining its weight per unit length.
    Type: Grant
    Filed: October 21, 1985
    Date of Patent: March 7, 1989
    Inventor: Ulrich Petersen