Patents by Inventor John C. Holden

John C. Holden 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).

  • Wellbore circulating valve
    Patent number: 4058165
    Abstract: A wellbore circulating valve especially useful in a string of testing tools utilizes a sequentially ratcheted inner mandrel which covers a series of flow ports and is opened by a predetermined sequence of operations which move the mandrel away from the flow ports thereby communicating the annulus with the inner bore of the tool.
    Type: Grant
    Filed: October 24, 1975
    Date of Patent: November 15, 1977
    Assignee: Halliburton Company
    Inventors: John C. Holden, Gary Q. Wray
  • Apparatus for testing oil wells
    Patent number: 3964305
    Abstract: An annulus pressure operated oil well testing and sampling apparatus utilizes hydrostatic pressue to supplement spring means which biases against valve means to hold the valve means closed until application of sufficient hydraulic pressure to the annular fluid opens the tool to the formation and allows testing operations to be performed. A subsequent intentional or inadvertent release or sudden extreme increase of applied pressure on the annular fluid actuates means to close the valve means against further formation fluid flow.
    Type: Grant
    Filed: February 19, 1974
    Date of Patent: June 22, 1976
    Assignee: Halliburton Company
    Inventors: Gary Q. Wray, John C. Holden
  • Wellbore circulating valve
    Patent number: 3930540
    Abstract: A wellbore circulating valve especially useful in a string of testing tools utilizes a sequentially ratcheted inner mandrel which covers a series of flow ports and is opened by a predetermined sequence of operations which move the mandrel away from the flow ports thereby communicating the annulus with the inner bore of the tool.
    Type: Grant
    Filed: October 10, 1974
    Date of Patent: January 6, 1976
    Assignee: Halliburton Company
    Inventors: John C. Holden, Gary Q. Wray