Patents by Inventor Darwin L. Holte

Darwin L. Holte 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).

  • Wireline grease head
    Publication number: 20080110613
    Abstract: Grease control head utilizing at least one ceramic insert for sealing around wireline, slick-line or braided wire while performing service operations in a well.
    Type: Application
    Filed: November 15, 2006
    Publication date: May 15, 2008
    Inventors: Darwin L. Holte, Joseph D. Greene