Patents by Inventor Heinz Groenefeld

Heinz Groenefeld 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).

  • Rotary spherical plug valve
    Patent number: 4260129
    Abstract: A rotary spherical plug valve having an annular valve seat, a closure member formed as a portion of sphere, support arms for supporting the closure member with one of the arms being connected to a driving shaft at a hub having a hole for admitting the shaft with a slightly larger diameter than the shaft and a force transmitting means in the form of a cylindrical connection member disposed between a semi-cylindrical groove in the shaft and a semi-cylindrical internal recess in the wall surrounding the hole in the hub.
    Type: Grant
    Filed: May 8, 1979
    Date of Patent: April 7, 1981
    Assignee: Honeywell Inc.
    Inventor: Heinz Groenefeld