Patents Assigned to Logic Devices, Inc.
  • Method and apparatus for venting entrapped air in mold cavities
    Patent number: 4091069
    Abstract: Air that becomes entrapped in a closed mold cavity during the injection of liquid plastic material into the cavity is vented into the flowing liquid coolant of the mold to be exhausted therewith while leakage of coolant into the mold cavity during nonventing is prevented by maintaining the coolant at less than atmospheric pressure.
    Type: Grant
    Filed: February 17, 1977
    Date of Patent: May 23, 1978
    Assignee: Logic Devices, Inc.
    Inventor: Paul E. Allen