Patents by Inventor Donald W. Mathison

Donald W. Mathison 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).

  • Patent number: 4215087
    Abstract: A device and method for forming an annular raised rib on a tubular member includes a mandrel having a primary portion which has a secondary portion slidably mounted on the outer end thereof. The inner end of the primary mandrel carried by a base. An expandle ring is carried by the secondary mandrel and the outer end of the primary mandrel. Further included is a movable die with means for moving the die to and upon the primary mandrel. The secondary mandrel is formed with an annular frusto-conical ramp for expanding the ring radially outwardly thereof which forces the wall of the tubular member outwardly thereby forming an annular raised rib on a tube of plastic mounted on the mandrels when the secondary mandrel is moved to and upon the primary mandrel.
    Type: Grant
    Filed: January 16, 1978
    Date of Patent: July 29, 1980
    Assignee: Product Design and Engineering, Inc.
    Inventor: Donald W. Mathison
  • Patent number: 4102623
    Abstract: A device and method for forming an annular raised rib on a tubular member includes a mandrel having a primary portion which has a secondary portion slidably mounted on the outer end thereof. The inner end of the primary mandrel carried by a base. An expandle ring is carried by the secondary mandrel and the outer end of the primary mandrel. Further included is a movable die with means for moving the die to and upon the primary mandrel. The secondary mandrel is formed with an annular frusto-conical ramp for expanding the ring radially outwardly thereof which forces the wall of the tubular member outwardly thereby forming an annular raised rib on a tube of plastic mounted on the mandrels when the secondary mandrel is moved to and upon the primary mandrel.
    Type: Grant
    Filed: April 29, 1977
    Date of Patent: July 25, 1978
    Assignee: Product Design & Engineering Inc.
    Inventor: Donald W. Mathison