1
James V Leggett III, Vladimir Dubinsky, Douglas Patterson: Measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers. Baker Hughes Incorporated, Madan Mossman & Sriram P C, September 2, 2003: US06614360 (54 worldwide citation)

An acoustic MWD system comprises at least one transmitter array and at least one receiver array spaced axially along an essentially tubular downhole subassembly. Each transmitter and receiver array includes a plurality of elements circumferentially disposed on the outside of the assembly. The downho ...


2
Joseph Barolak, Alexei Bolshakov, Vladimir Dubinsky, Douglas Patterson: Use of electromagnetic acoustic transducers in downhole cement evaluation. Baker Hughes Incorporated, Timothy Donoughue, Keith R Derrington, December 19, 2006: US07150317 (14 worldwide citation)

A bond log device comprising a sonde, an acoustic transducer, and an acoustic receiver. The acoustic transducer is comprised of a magnet combined with a coil, where the coil is energizable by an electrical current source. The acoustic transducer can also be comprised of an electromagnetic acoustic d ...


3
Xiao Ming Tang, Alexei Bolshakov, Tsili Wang, Douglas Patterson: Method and apparatus for cement bond evaluation using transversely polarized shear waves. Baker Hughes Incorporated, Bracewell & Guiliani, April 28, 2009: US07525872 (12 worldwide citation)

A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus produce a transversely polarized shear wave and emit the wave through the casing and into the wellbore. The transversely polarized she ...


4
Isao Inoue, Michael Schlitzkus, Andreas Weh, Douglas Patterson: Hydraulic unit for an anti-lock vehicle brake system. Robert Bosch, Ronald E Greigg, January 25, 2005: US06846050 (8 worldwide citation)

The invention relates to a hydraulic unit for an anti-lock vehicle brake system, having a housing block with a first row of valve receiving chambers for receiving inlet valves, and a second row of valve receiving chambers for receiving outlet valves a pump receiving chamber, whose longitudinal axis ...


5
Charles E Redding, Herbert W Beimgraben, Charles Hartmann, Douglas Patterson: Acoustic isolator for well logging system. Baker Hughes Incorporated, Madan Mossman & Sriram P C, November 23, 2004: US06820716 (7 worldwide citation)

An acoustic isolator for attenuating through-tool acoustic signals comprises a plurality of u-shaped link members, where each link member has two sets of ears. A plurality of yoke members are adapted to fit between cooperating sets of ears. A plurality of pins connect the plurality of u-shaped link ...


6
Andreas Weh, Tomoya Ideguchi, Nathan McCormick, Douglas Patterson: Hydraulic unit. Robert Bosch, Ronald E Greigg, March 22, 2005: US06869152 (4 worldwide citation)

A hydraulic unit for an electronically controllable brake system of a vehicle includes a housing block with mounting faces for instance for an electric motor and an electronic control unit; a plurality of connections for hydraulically contacting the block; and installation chambers, for pump element ...


7
Charles E Redding, Herbert W Beimgraben, Charles Hartmann, Douglas Patterson: Acoustic isolator for well logging system. Baker Hughes Incorporated, Madan & Sriram P C, January 26, 2010: US07650963 (2 worldwide citation)

An acoustic isolator for attenuating through-tool acoustic signals comprises a plurality of u-shaped link members, where each link member has two sets of ears. A plurality of yoke members are adapted to fit between cooperating sets of ears. A plurality of pins connect the plurality of u-shaped link ...


8
Xiao Ming Tang, Alexei Bolshakov, Joseph Barolak, Douglas Patterson, Vladimir Dubinsky, Ron Alers, George Alers: Use of Lamb waves in cement bond logging. Baker Hughes Incorporated, Bracewell & Giuliani, February 16, 2010: US07663969 (1 worldwide citation)

A method and apparatus useful to determine the integrity of a cement bond log disposed in the annular space between a casing and a wellbore. The method and apparatus induce a Lamb wave in the casing and into the wellbore. The Lamb wave attenuates upon passage through the cement bond log. The integri ...


9
John Douglas Patterson: Load sharing bone plate. Avanti Orthopaedics, Invention To Patent Services, Alex Hobson, November 14, 2017: US09814503

A load sharing bone plate has a plurality of directional apertures configured to effectively support and share the load with a fractured bone to promote healing. A load sharing bone plate may have a body portion that is thinner and be configured to be secured with smaller fasteners than conventional ...


10
Feyzi Inanc, Douglas Patterson, Elizaveta Onegova, Rocco DiFoggio, Otto Fanini: Constrained backscatter gamma ray casing and cement inspection tool. BAKER HUGHES A GE COMPANY, Mossman Kumar & Tyler PC, January 22, 2019: US10185052

Methods, systems, devices, and products for estimating at least one parameter of interest of a volume of interest of an earth formation using nuclear radiation based measurements. Logging tools include a limited aperture collimated radiation beam source, detectors, and at least one processor configu ...