Patents by Inventor Nicholas Verhoeven

Nicholas Verhoeven 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).

  • Grooved pump chamber walls for flushing fiber deposits
    Patent number: 5318415
    Abstract: A rotary lobe pump has a pair of rotary lobes rotatably mounted in a pump chamber having end walls perpendicular to axes of the lobes and a side wall with which the rotors making sealing contact. At least one of the end walls is provided with a shallow groove in a region between the axes, the groove being of a selected depth and width to permit solid material lodged between the rotors and at least one of the end walls to become disengaged and flushed out while allowing a minimum of fluid to flow through the groove causing pressure loss in the pump.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: June 7, 1994
    Assignee: Gramprotex Holdings Inc.
    Inventor: Nicholas Verhoeven