Patents by Inventor Ralph William Welsh

Ralph William Welsh 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 apparatus
    Patent number: 5968564
    Abstract: A molded container top 140 has engravings 145 formed by an embossing 108. The core 120 withdrawn from the cavity 102 and a retaining ring 110 holds the hot molded part 140 in the cavity 102. The molded part 140 shrinks away from the cavity 102 and is pushed out of the cavity 102 by an ejector 105. The part 140 has no witness lines on its circumferential skirt 142.
    Type: Grant
    Filed: June 18, 1997
    Date of Patent: October 19, 1999
    Assignee: Kord Products Limited
    Inventors: Ralph William Welsh, Geoffrey Walker
  • Injection molding method
    Patent number: 5695706
    Abstract: A molded container top 140 has engravings 145 formed by an embossing 108. The core 120 withdrawn from the cavity 102 and a retaining ring 110 holds the hot molded part 140 in the cavity 102. The molded part 140 shrinks away from the cavity 102 and is pushed out of the cavity 102 by an ejector 105. The part 140 has no witness lines on its circumferential skirt 142.
    Type: Grant
    Filed: April 15, 1996
    Date of Patent: December 9, 1997
    Assignee: Kord Products Limited
    Inventors: Ralph William Welsh, Geoffrey Walker