Patents by Inventor Douglas B. Leeth

Douglas B. Leeth 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).

  • Tool trap assembly and method
    Patent number: 7530401
    Abstract: An apparatus (100) and a method to prevent undesired objects (not shown) when communication conduit (not shown) is disposed therethrough. The apparatus (100) and method include a flapper assembly (150) to selectively open and close when objects (not shown) larger than the communications conduit (not shown) are desired to pass therethrough.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: May 12, 2009
    Inventors: Max H. Smith, Douglas B. Leeth, John A. Lemke
  • Tool Trap Assembly and Method
    Publication number: 20080236838
    Abstract: An apparatus (100) and a method to prevent undesired objects (not shown) when communication conduit (not shown) is disposed therethrough. The apparatus (100) and method include a flapper assembly (150) to selectively open and close when objects (not shown) larger than the communications conduit (not shown) are desired to pass therethrough.
    Type: Application
    Filed: May 3, 2005
    Publication date: October 2, 2008
    Applicant: ADVANCE MANUFACTURING TECHNOLOGY, INC.
    Inventors: Max H. Smith, Douglas B. Leeth, John A. Lemke
  • Articulated drillstring entry apparatus and method
    Patent number: 7131497
    Abstract: Apparatuses and methods to allow tools disposed upon a conduit to enter the bore of a drillstring is presented. The apparatuses and methods include the use of one or more articulated knuckle joints at ends of an entry sub. The articulated knuckle joints are capable of articulating the entry sub among various conduit entry and load carrying positions.
    Type: Grant
    Filed: March 23, 2004
    Date of Patent: November 7, 2006
    Assignee: Specialty Rental Tools & Supply, LP
    Inventors: Charles M. Helms, Vernon E. Kauffman, Douglas B. Leeth, John A. Lemke, Max H. Smith