Patents by Inventor Darwin A. Miller

Darwin A. Miller 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).

  • Patent number: 4998435
    Abstract: A method of testing pipe sections at an oil rig floor by means of an internal pipe testing tool and a pressurized gas containing helium in a ratio of helium to a carrier gas of at least about 1:2856 by volume. The gas is pressurized in a hydraulic accumulator remote from the rig floor. The pressurized gas actuates the test tool at substantially the same pressure as is used for testing the pipe section. A flexible enclosure confines the test gas which leaks from the pipe section. The enclosure define a substantially annular chamber around the area to be tested to confine leakage test gas to prevent its dissipation into the atmosphere. An aperture is provided in the enclosure to permit a sensing probe to be inserted into the annular chamber between the enclosure and the pipe section to sense the presence of test gas.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: March 12, 1991
    Assignee: Damco Testers, Inc.
    Inventors: Ronnie F. Miller, Arthur L. Dwyer, Darwin A. Miller, Darwin L. Miller
  • Patent number: 4879896
    Abstract: A method of testing pipe sections at an oil rig floor by means of an internal pipe testing tool and a pressurized gas containing helium in a ratio of helium to a carrier gas of at least about 1:2856 by volume. The gas is pressurized in a hydraulic accumulator remote from the rig floor. The pressurized gas a actuates the test tool at substantially the same pressure as is used for testing the pipe section. A flexible enclosure confines the test gas which leaks from the pipe section. The enclosure defines a substantially annular chamber around the area to be tested to confine leakage test gas to prevent its dissipation into the atmosphere. An aperture is provided in the enclosure to permit a sensing probe to be inserted into the annular chamber between the enclosure and the pipe section to sense the presence of test gas.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: November 14, 1989
    Inventors: Ronnie F. Miller, Arthur L. Dwyer, Darwin A. Miller, Darwin L. Miller
  • Patent number: 4727749
    Abstract: A method of testing pipe sections at an oil rig floor by means of an internal pipe testing tool and a pressurized gas containing helium in a ratio of helium to a carrier gas of at least about 1:2856 by volume. The gas is pressurized in a hydraulic accumulator remote from the rig floor. The pressurized gas actuates the test tool at substantially the same pressure as is used for testing the pipe section. A flexible enclosure confines the test gas which leaks from the pipe section. The enclosure defines a substantially annular chamber around the area to be tested to confine leakage test gas to prevent its dissipation into the atmosphere. An aperture is provided in the enclosure to permit a sensing probe to be inserted into the annular chamber between the enclosure and the pipe section to sense the presence of test gas.
    Type: Grant
    Filed: May 29, 1986
    Date of Patent: March 1, 1988
    Assignee: Damco Testers, Inc.
    Inventors: Ronnie F. Miller, Arthur L. Dwyer, Darwin A. Miller, Darwin L. Miller
  • Patent number: 4601194
    Abstract: A method of testing pipe sections at an oil rig floor by means of an internal pipe testing tool and a pressurized gas containing helium in a ratio of helium to a carrier gas of at least about 1:2856 by volume. The gas is pressurized in a hydraulic accumulator remote from the rig floor. The pressurized gas actuates the test tool at substantially the same pressure as is used for testing the pipe section. A flexible enclosure confines the test gas which leaks from the pipe section. The enclosure defines a substantially annular chamber around the area to be tested to confine leakage test gas to prevent its dissipation into the atmosphere. An aperture is provided in the enclosure to permit a sensing probe to be inserted into the annular chamber between the enclosure and the pipe section to sense the presence of test gas.
    Type: Grant
    Filed: January 18, 1984
    Date of Patent: July 22, 1986
    Assignee: Damco Testers, Inc.
    Inventors: Ronnie F. Miller, Arthur L. Dwyer, Darwin A. Miller, Darwin L. Miller
  • Patent number: 4480462
    Abstract: A portable hydrostatic test apparatus for pressure testing fluid system components. Hydraulic fluid is pressurized and serves as the pressure source for imposing a desired test pressure on a water filled system. The apparatus includes a pneumatically operated control valve to control a directional control valve in the hydraulic system. The several valves in the hydraulic system are mounted on and interconnected through an internally ported manifold to eliminate hoses.
    Type: Grant
    Filed: October 25, 1982
    Date of Patent: November 6, 1984
    Assignee: Damco Testers, Inc.
    Inventor: Darwin A. Miller