Patents by Inventor Idar G. Johnsen

Idar G. Johnsen 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).

  • High pressure converter for deep well drilling
    Patent number: 5246080
    Abstract: A pressure converter for a drill pipe includes a housing with a header channel therein which is in communication with a drill bit, a drive unit which is driven by a driving drilling fluid flow of the drill pipe, a valve which is operatively connected to and moved by the drive unit, a piston which moves in a reciprocating manner thereby creating a pressure stroke and a return stroke, and a check valve through which a portion of the drilling fluid flow is discharged to the drill bit via the header channel.
    Type: Grant
    Filed: May 6, 1992
    Date of Patent: September 21, 1993
    Assignee: Den norske stats oljeselskap a.s.
    Inventors: Kunt Horvei, Idar G. Johnsen