Patents by Inventor Paul Knowlton

Paul Knowlton 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).

  • Ringless paint container
    Patent number: 4936482
    Abstract: An especially configured, ringless, container-lid, design is disclosed having improved sealing characteristics applicable to paint containers for the consuming public. The rim portion of the container is provided with a tapered, especially shaped wall section terminating in a circular bead which is received in a sealing groove in the lid. The wall section flexes to maintain the seal established between the lid and the bead while sufficiently rigidized to prevent collapse of the container's sidewall. The design disclosed permits easy modification of the container for serially stacking thereof.
    Type: Grant
    Filed: April 10, 1989
    Date of Patent: June 26, 1990
    Assignee: Van Dorn Company
    Inventors: Thomas A. Gallagher, Paul Knowlton, Leon Patarini
  • Ringless paint container
    Patent number: 4880131
    Abstract: An especially configured, ringless, container-lid design is disclosed having improved sealing characteristics applicable to paint containers for the consuming public. The rim portion of the container is provided with a tapered, especially shaped wall section terminating in a circular bead which is received in a sealing groove in the lid. The wal section flexes to maintain the seal established between the lid and the bead while sufficiently rigidized to prevent collapse of the container's sidewall. The design disclosed permits easy modification of the container for serially stacking thereof.
    Type: Grant
    Filed: November 13, 1987
    Date of Patent: November 14, 1989
    Assignee: Van Dorn Company
    Inventors: Thomas A. Gallagher, Paul Knowlton, Leon Patarini
  • Combined can and closure
    Patent number: D329597
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: September 22, 1992
    Assignee: Van Dorn Company
    Inventors: Thomas A. Gallagher, Leon Patarini, Paul Knowlton