Patents by Inventor A. J. Mallett

A. J. Mallett 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: 10113477
    Abstract: A turbocharger (10) has an improved wastegate valve assembly (32) wherein a valve member (35) moves freely within a lever arm (34A), and therefore, is displaceable sidewardly across the opening (28) of the wastegate port (28). The valve member (35) and associated seat (36) respectively have male and female forms so as to sealingly engage with each other when the valve body (35) is in the closed position. As such, the valve member (35) can move freely as it engages the seat (36) to provide a tight uniform seal therebetween. Additionally, the seat (36) may be formed as an insert which fits within the wastegate port (28) and is also free floating in the direction extending across the port (28) which further assists in self-centering of the valve member (35) and seat (36).
    Type: Grant
    Filed: March 21, 2014
    Date of Patent: October 30, 2018
    Assignee: BorgWarner Inc.
    Inventors: Christoper J. Mallett, Richard Haering
  • Publication number: 20160032818
    Abstract: A turbocharger (10) has an improved wastegate valve assembly (32) wherein a valve member (35) moves freely within a lever arm (34A), and therefore, is displaceable sidewardly across the opening (28) of the wastegate port (28). The valve member (35) and associated seat (36) respectively have male and female forms so as to sealingly engage with each other when the valve body (35) is in the closed position. As such, the valve member (35) can move freely as it engages the seat (36) to provide a tight uniform seal therebetween. Additionally, the seat (36) may be formed as an insert which fits within the wastegate port (28) and is also free floating in the direction extending across the port (28) which further assists in self-centering of the valve member (35) and seat (36).
    Type: Application
    Filed: March 21, 2014
    Publication date: February 4, 2016
    Inventors: Christoper J. MALLETT, Richard HAERING
  • Patent number: 5678643
    Abstract: A LWD tool is disclosed for detecting the existence of and distance to adjacent bed boundaries. A transmitter assembly generates either a short acoustic pulse or a swept frequency signal that is detected by an associated receiver assembly. The received signal(s) are conditioned and converted to high precision digital signals by an A/D converter. The digitized signals are accumulated and transferred to a digital signal processor via a high speed data bus. The digital signal processor also receives a digital signal representing the transmission signal and compares the transmission signal and the received signals together to enable a downhole microprocessor to derive a time lag for the received signals.
    Type: Grant
    Filed: October 18, 1995
    Date of Patent: October 21, 1997
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Carl Arthur Robbins, A. J. Mallett, John Wesley Minear, Batakrishna Mandal, James Robert Birchak, Eugene Joseph Linyaev
  • Patent number: 5639997
    Abstract: Disclosed is a sonic well tool for performing acoustic investigations of subsurface geological formations penetrated by a borehole, and a method of logging formation data. The well tool generally includes a longitudinally extending body for positioning in said borehole. The tool also includes a transmitter supported by the body for transmitting acoustic energy, and at least two receivers. One of the receivers is positioned on the interior of the sonic tool to receive the acoustic signals that traverse the sonic well tool. The second receiver is positioned on the exterior of the sonic tool and receive sonic signals that traverse the sonic tool and those that traverse the formation. The apparatus further includes a processor for subtracting the well tool signal of the first receiver from the combined well tool and formation signal of the second receiver.
    Type: Grant
    Filed: August 23, 1996
    Date of Patent: June 17, 1997
    Assignee: Halliburton Company
    Inventor: A. J. Mallett
  • Patent number: 5313025
    Abstract: This disclosure is directed to a displacement amplifier for forming acoustic pulses and more particularly to one which incorporates a flexible movable lightweight diaphragm of rectangular configuration. It has upper and lower ends which are connected to opposing piston rods driven by duplicate pistons and double acting cylinders. The cylinders are located at opposite ends of the diaphragm or membrane. They are supported in an elongate tool which positions the flexible membrane in a generally rectangular window. This enables the membrane to flex as the pistons are driven, thereby enabling the flexure of the membrane to form dipole source for radially directed compression waves transmitted from the membrane in the window.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: May 17, 1994
    Assignee: Halliburton Logging Services, Inc.
    Inventors: Dennis E. Roessler, A. J. Mallett
  • Patent number: 4700803
    Abstract: For use in acoustic logging, an acoustic wave transducer system forming both compression and shear waves is disclosed, the system having the preferred form of a plurality of radially directed magnetostrictive expansion means, being N in number, each having a transducer plate affixed to the outer end thereof and further including means for providing a current to a coil wound thereabout forming flux initiating magnetostrictive expansion and contraction to form compression or shear waves.
    Type: Grant
    Filed: September 29, 1986
    Date of Patent: October 20, 1987
    Assignee: Halliburton Company
    Inventors: A. J. Mallett, John W. Minear
  • Patent number: 4580252
    Abstract: For use in an acoustic logging tool having a sonde adapted to be lowered in a borehole, an improved acoustic transducer comprising a pyramidal frustrum is disclosed. The preferred embodiment incorporates fifteen sides. Each side mounts a piezoelectric crystal for receiving. Mechanical resonant frequencies of the transducer are outside the receiver band width which is about 25 kHz. The resonant frequencies are above 25 kHz, thereby avoiding primary resonant frequencies within the band width.
    Type: Grant
    Filed: April 20, 1983
    Date of Patent: April 1, 1986
    Assignee: Halliburton Company
    Inventor: A. J. Mallett
  • Patent number: 4493062
    Abstract: For use with an acoustic transmitter in an acoustic well logging tool, an improved transducer modification circuit is set forth in the preferred and illustrated embodiment. The circuit of this disclosure modifies the diameter resonant frequency of a piezoelectric transducer, thereby expanding the frequency range downward for the transmitter transducer by moving the diameter resonant frequency.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: January 8, 1985
    Assignee: Halliburton Company
    Inventor: A. J. Mallett
  • Patent number: 4450540
    Abstract: An acoustic energy mode propagation speed or travel time measurement system for use in well logging is disclosed. A downhole sonde is provided with an acoustic transmitter and at least one acoustic receiver. The transmitter is repetitively driven with a unique or characteristic swept frequency signal. Propagated acoustic energy detected at the receiver is cross-correlated with the characteristic transmitter swept frequency signal to provide indications of the arrival of various modes of acoustic energy propagation at the receiver. Logs as a function of borehole depth of the speed of propagation of the various modes of propagation may be derived.
    Type: Grant
    Filed: August 20, 1982
    Date of Patent: May 22, 1984
    Assignee: Halliburton Company
    Inventor: A. J. Mallett
  • Patent number: 3946357
    Abstract: A method and apparatus for seismic geophysical exploration including a seismic energy source, a control means, a plurality of geophones, and a plurality of geophone monitoring means, all located in a selected survey area. Each geophone monitoring means is positioned in relatively close physical proximity and electrically coupled to one or more of the geophones forming a set of geophones. The control means is utilized to generate electrical signals containing data initiating the operation of the seismic energy source and the plurality of geophone monitoring means. The electrical signals generated by the various geophones in a set responsive to a particular shot of the seismic energy source are received by the associated geophone monitoring means. Apparatus contained within the associated geophone monitoring means samples such geophone signals and produces representative data in digital form. The digitized data is stored in a memory device contained within the geophone monitoring means.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: March 23, 1976
    Assignee: The Superior Oil Company
    Inventors: David Harold Weinstein, Monroe Alfred Ashworth, III, A. J. Mallett