Patents by Inventor Karl R. Berdan

Karl R. Berdan 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).

  • Gas assist needle in a molding machine
    Patent number: 6386852
    Abstract: An injection needle for use in a mold cavity of a gas-assisted injection molding machine. The injection needle includes a tubular member and a stem slidably disposed in the tubular member. The stem is positionable in a raised position and a retracted position. The injection needle further includes a central bore extending within the stem for supplying a gas and a slot. The slot is operable for relieving gas pressure within the mold cavity when the stem is in the retracted position.
    Type: Grant
    Filed: February 22, 2000
    Date of Patent: May 14, 2002
    Assignee: ASC Incorporated
    Inventor: Karl R. Berdan