Patents Assigned to John D. Northrup, Jr.
  • Method for manufacturing glass bottles
    Patent number: 4336050
    Abstract: A method of forming parisons in machines for making glass bottles which includes introducing a gob of molten glass into a blank mold, moving a cavity plunger to form a parison cavity and subsequently subjecting the gob to a predetermined pressure separate from the cavity plunger to apply pressure urging the molten glass into conformity with the mold.
    Type: Grant
    Filed: July 28, 1980
    Date of Patent: June 22, 1982
    Assignees: John D. Northrup, Jr., Ruth Northup, Nancy Northup Lehrkind, Mary Northup
    Inventor: John D. Northup