Patents by Inventor Heijiro Sakurai

Heijiro Sakurai 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).

  • Injection molding system for making preform with undercut
    Patent number: 5232718
    Abstract: An injection molding system is used to mold a preform having an undercut. The molding system includes an injection core mold, and three injection cavity molds, which are a neck mold for defining a neck of the preform, a first cavity mold including two mold halves for defining an outer wall of the preform having the undercut, and a second cavity mold for defining a remaining outer wall of the preform. The molding system also includes a clamping unit for opening and clamping the foregoing molds and a mold half opening mechanism for opening and clamping mold halves of the first cavity mold.
    Type: Grant
    Filed: September 23, 1991
    Date of Patent: August 3, 1993
    Assignee: Nissei ASB Machine Co., Ltd.
    Inventors: Yoshiki Miyazawa, Hidehiko Fukai, Heijiro Sakurai