Patents by Inventor Rolf Martin Holmen

Rolf Martin Holmen 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).

  • Patent number: 5868298
    Abstract: The present invention relates to a method for manufacturing shells, wherein a belt is attached to the outer surface of the shell by friction welding. The method is particularly favorable for welding bands to thin-walled shells. In the method, prior to the welding process, the shell is hardened and/or tempered for optimizing its properties during use and, after hardening and/or tempering, the shell receives the belt by friction welding, during which the temperature of the shell is kept at a level which does not reduce the qualities of the shell to a substantial degree.
    Type: Grant
    Filed: November 8, 1996
    Date of Patent: February 9, 1999
    Assignee: Raufoss Technology AS
    Inventors: Rolf Martin Holmen, Vegard Sande