Patents by Inventor Wendell Doolin

Wendell Doolin 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).

  • Sand injector retainer insert
    Patent number: 5299622
    Abstract: A blow tube unit includes a retainer insert assembly with a restrictor and an injector blow tip. The restrictor includes restricting means to prevent the communication of a thermosetting fluent material from a reservoir to a sand core mold in the absence of blow cycle pressure. Constructed from a single block of metal, the restrictor is detachably secured to a lower portion of the blow tube unit in order to allow for removal and cleaning. The injector blow tip is made from an elastomeric material and is detachably secured to a lower portion of the restrictor.
    Type: Grant
    Filed: December 4, 1992
    Date of Patent: April 5, 1994
    Assignee: Tooling & Equipment International, Inc.
    Inventor: Wendell Doolin