Patents by Inventor Charles M. Holland

Charles M. Holland 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).

  • Two-step injection molding
    Patent number: 4059384
    Abstract: A method and apparatus for injection molding plastic articles which have a relatively thin wall portion is disclosed. A primary core is inserted into a cavity to form the basic mold, and molten plastic is injected into the mold. A secondary core is projected partially into the mold at the section of the mold adapted to form the thin wall portion of the article before the plastic is fully cured to thin the plastic at that section. The plastic is then allowed to fully cure to form the article, and it is removed from the mold.
    Type: Grant
    Filed: July 7, 1976
    Date of Patent: November 22, 1977
    Assignee: Misto.sub.2 Gen Equipment Co.
    Inventors: Charles M. Holland, Lawrence W. Parrack
  • Two-step injection molding
    Patent number: 3996329
    Abstract: A method for injection molding plastic articles which have a relatively thin wall portion is disclosed. A primary core is inserted into a cavity to form the basic mold, and molten plastic is injected into the mold. A secondary core is projected partially into the mold at the section of the mold adapted to form the thin wall portion of the article before the plastic is fully cured to thin the plastic at that section. The plastic is then allowed to fully cure to form the article, and it is removed from the mold.
    Type: Grant
    Filed: January 20, 1975
    Date of Patent: December 7, 1976
    Assignee: Misto & Gen Equipment Co.
    Inventors: Charles M. Holland, Lawrence W. Parrack