Patents by Inventor James Chi-Hwi Wang

James Chi-Hwi Wang 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).

  • Hot pin parison injection molding technique
    Patent number: 4054630
    Abstract: Parisons for use in making blow molded highly molecularly oriented plastic bottles are injection molded using a cooled cavity and a relatively hot core pin to prevent the formation of residual internal stress in or near the surface of the parison. The pin is maintained at a temperature above the glass transition temperature of the resin to reduce the formation of cracks when the parison is subsequently blow molded in the orientation temperature range.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: October 18, 1977
    Assignee: American Can Company
    Inventor: James Chi-Hwi Wang
  • Transfer blow molding technique
    Patent number: 4054629
    Abstract: Parisons are injection molded using a cooled cavity and a relatively hot core pin to prevent the formation of residual internal stress in or near the inner surface of the parison. The parison is promptly transferred while still hot from the injection mold to a temperature conditioning station to provide a desired temperature distribution and the temperature conditioned parison is highly molecularly biaxially oriented as it is blow molded.
    Type: Grant
    Filed: January 22, 1976
    Date of Patent: October 18, 1977
    Assignee: American Can Company
    Inventors: James Chi-Hwi Wang, Ilie Mila Belivakici, Robert Richard Young