Patents by Inventor Paul E. Butler

Paul E. Butler 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).

  • Flapper valve assembly apparatus and method
    Patent number: 6394187
    Abstract: The flapper valve assembly can be used in series to provide collapsible closures in a drill pipe. Thus, when work strings are withdrawn through the flapper valve, it will close in a conventional manner. However, when the work string must be reinserted through the closed flapper, a collar holding the flapper in its closed position can be sheared from its position within the assembly housing.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: May 28, 2002
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Rennie L. Dickson, Michael V. Vinzant, Paul E. Butler
  • Compact ram tube engine air intake manifold
    Patent number: 4440120
    Abstract: A compact ram tube plenum type intake manifold for a V-type internal combustion engine comprises a generally barrel shaped housing mountable between the engine cylinder banks and defining a compact space in which ram intake passages are interdigitally coiled around the periphery of the walls with remaining portions of the interior space being utilized as an intake plenum. Manufacture in separable sections and other features are also provided for.
    Type: Grant
    Filed: May 24, 1982
    Date of Patent: April 3, 1984
    Assignee: General Motors Corporation
    Inventor: Paul E. Butler