Patents Assigned to Griffin Wellpoint Corporation
  • Patent number: 3968847
    Abstract: A wellpoint jetting head having a plurality of spade-like teeth annularly positioned around the forward end of the head and projecting longitudinally therefrom for dislodging and chopping of the soil during hydrostatic jetting in combination with a tilting, side-to-side, rotational and/or up-and-down manipulation of the wellpoint. The teeth are beveled in a counterbalancing inward-outward staggered arrangement with the cutting surface formed by the teeth ends defining a cutting plane canted with respect to the longitudinal axis of the head. The teeth are circumferentially spaced providing lateral confronting side faces for dislodging soil particulate during use.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: July 13, 1976
    Assignee: Griffin Wellpoint Corporation
    Inventor: David A. Werblin
  • Patent number: 3930538
    Abstract: A wellpoint having an outer screen pipe, and an inner intake pipe connected to a vacuum source. A positionable valve is mounted between the screen pipe and the intake pipe to regulate the amount of screen pipe surface subject to vacuum by the intake pipe.
    Type: Grant
    Filed: November 5, 1974
    Date of Patent: January 6, 1976
    Assignee: Griffin Wellpoint Corporation
    Inventors: Walter W. Brennan, Charles R. Myers, Paul E. Perry