Patents Assigned to Package Research Corporation
  • Patent number: 5253787
    Abstract: A dispenser for a fluid substance, such as toothpaste, includes an elongated tube having an open top and an open bottom with a chamber therebetween for holding the substance. A bottom closure is mounted to the open bottom to close the open bottom. The bottom closure is longitudinally movable in a sealing manner in the open bottom to press against the substance and to move into the chamber as the substance is being dispensed. A flexible membrane sealing closes the open top of the tube. A nozzle extends through the membrane having a longitudinal passageway communicating with the chamber for dispensing the substance when the nozzle is moved to a dispensing orientation. The membrane is made of a stretchable resilient material so that the nozzle may be titled to the dispensing orientation and thereby stretch the membrane and force the membrane into the chamber to reduce the size of the chamber and cause a portion of the substance to flow through the nozzle.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: October 19, 1993
    Assignee: Package Research Corporation
    Inventors: William T. Wilkinson, John J. Nelson
  • Patent number: 4858785
    Abstract: A dispenser for two distinct fluids includes a container having a chamber for each of the fluids. The fluid chambers communicate with a mixing chamber at the top of the container leading to a dispensing spout. Mixing ports in the wall of the mixing chamber permit the fluids to mix before being dispensed from the container.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: August 22, 1989
    Assignee: Package Research Corporation
    Inventor: William T. Wilkinson
  • Patent number: D296060
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: June 7, 1988
    Assignee: Package Research Corporation
    Inventor: William T. Wilkinson