Patents Assigned to Roto Plastics, Inc.
  • Method of making a rotary molded plastic member with variable wall thickness
    Patent number: 6409954
    Abstract: A one-piece face mask with an integral inflatable cushion for use in providing an anesthetic to a patient. The mask has a dome shape outer wall terminating at its circumference in a thickened base on which the inflatable cushion is supported. The one-piece mask is formed by a combination of a rotational plastic molding process and gravity casting, which enables the different parts of the mask to be made of different thicknesses related to the function performed by the different parts in use of the mask.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: June 25, 2002
    Assignee: Roto Plastics, Inc.
    Inventor: David C. Mulligan
  • Method of making an automobile roof cap
    Patent number: 4891085
    Abstract: A method of manufacturing a decorative automobile roof cap by forming a flat composite of a thermoplastic cover member laminated to a core layer foam sheet, thermoforming the composite to the desired shape and forming the edges of the roof cap by removing a portion of the core layer from the cover member and then wrapping the excess cover member around the edges of the core layer and securing it to the underside of the core layer to form an edge covered with the cover member.
    Type: Grant
    Filed: November 4, 1988
    Date of Patent: January 2, 1990
    Assignee: Roto Plastics, Inc.
    Inventor: David C. Mulligan