Patents by Inventor P. Boyd

P. Boyd 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: 5008626
    Abstract: A portable DC miniature lamp tester is formed by a generally rectangular translucent body formed from plastic material having an open socket therein for reception of the bayonet end of the lamp and a pair of conventional snap-tab connectors for cooperatively connecting the body to the terminals of a conventional 9-volt dry cell battery. The auxiliary lamp is illuminated when either the incandescent filament of the lamp under test or its shunt is still good and conducts current.
    Type: Grant
    Filed: May 17, 1990
    Date of Patent: April 16, 1991
    Inventor: William P. Boyd, Sr.
  • Patent number: 4993055
    Abstract: X-ray tube includes a rotatable envelope in which is mounted an electron gun at one end and a target anode at the other end. A fixed means for deflecting the electron beam from the electron gun is provided to deflect the electron beam on a fixed path as the envelope of the x-ray tube rotates about an axis. The electron beam being confined to a fixed path results in the electron beam striking various positions of the target anode to provide for improved heat dissipation. The electron beam is deflected along the fixed path using magnetic deflection means including magnetic deflection coils positioned external of the envelope to provide a deflection field transverse to the electron beam. The target anode is cooled by directing a cooling fluid on an external side of the target anode.
    Type: Grant
    Filed: November 23, 1988
    Date of Patent: February 12, 1991
    Assignee: Imatron, Inc.
    Inventors: Roy E. Rand, Douglas P. Boyd, Kristian R. Peschmann
  • Patent number: 4977585
    Abstract: A compact computerized tomographic x-ray scanner having a patient tunnel in which the walls and the ends of the patient tunnel include shielding material to form a shielded enclosure in which the patient body portion is scanned.
    Type: Grant
    Filed: April 5, 1989
    Date of Patent: December 11, 1990
    Assignee: Imatron, Inc.
    Inventor: Douglas P. Boyd
  • Patent number: 4736396
    Abstract: A tomogram is obtained by tomosynthesis in a high speed CT scanning system in which fan beams of radiation are generated by sweeping an electron beam along a target, and collimated X-rays emitted by the target are received by an array of detectors after passing through a patient area between the target and array of detectors. The patient is moved through the collimated x-rays as the measurments are obtained, and the measurements are time-correlated to correspond to data measurements for a plurality of projection radiographs. The measurements for the plurality of radiographs are combined to tomosynthesize a tomogram at a selected plane in the patient.
    Type: Grant
    Filed: August 5, 1986
    Date of Patent: April 5, 1988
    Assignee: Imatron, Inc.
    Inventors: Douglas P. Boyd, Brian K. Rutt
  • Patent number: 4728395
    Abstract: A method of manufacturing controlled electrical resistivity carbon fiber sheet products employing a carbonizable starting material, heating and drawing the starting material (if required,) oxidizing the starting material at an elevated temperature of the order of 220 degrees Centigrade to effect molecular aromatic rearrangement of the starting material, carbonizing the oxidized starting material at an elevated temperature in an oxygen free atmosphere within a furnace having an elevated temperature extending over a temperature range to about 1400 degrees Centigrade by soaking the starting material at an elevated temperature for a predetermined period of time to provide a preselected electrical resistivity to the carbonized material. The carbonized material thus treated is formed into end carbon fiber sheet products having the form of paper, woven fabric and the like having a desired electrical resistivity. The starting carbonizable material consists essentially of PAN.
    Type: Grant
    Filed: October 12, 1984
    Date of Patent: March 1, 1988
    Assignee: Stackpole Fibers Company, Inc.
    Inventor: George P. Boyd, Jr.
  • Patent number: 4352021
    Abstract: A high speed multiple section, computed-tomographic x-ray scanner is provided. The scanner utilizes a multiple-anode, scanning electron beam x-ray source to provide high speed scanning of sections of the body. No mechanical motion is involved.
    Type: Grant
    Filed: January 7, 1980
    Date of Patent: September 28, 1982
    Assignee: The Regents of the University of California
    Inventors: Douglas P. Boyd, William B. Herrmannsfeldt, James R. Quinn, Robert A. Sparks
  • Patent number: 4138721
    Abstract: A fan-shaped beam or a fan array of individual beamlets of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a planar slice of the body to be analyzed to a position sensitive detector. The fan beam and the detector are caused to move in a rectilinear or nearly rectilinear fashion so that the individual beamlets or rays of penetrating radiation scan across the body and each detector records a parallel ray shadowgraph at a different angle of rotation (scan angle) with respect to the body and covering a range of scan angles less than 180.degree. and typically approximately 90.degree.. The recorded shadowgraphic data is then reconstructed into a 3-D tomograph of the body using a method of successive approximations. The resultant scanner may be used to analyze planes of the body parallel to the major axis thereof such as saggital or coronal as well as transaxial planes.
    Type: Grant
    Filed: November 11, 1976
    Date of Patent: February 6, 1979
    Assignee: Board of Trustees of The Lelane Standard Junior University
    Inventor: Douglas P. Boyd
  • Patent number: 4075491
    Abstract: A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. the reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected.
    Type: Grant
    Filed: November 3, 1976
    Date of Patent: February 21, 1978
    Assignee: The Board of Trustees of Leland Stanford, Jr. University
    Inventor: Douglas P. Boyd
  • Patent number: 4075492
    Abstract: A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: February 21, 1978
    Assignee: The Board of Trustees of Leland Stanford Junior University
    Inventors: Douglas P. Boyd, Michael Goitein
  • Patent number: 3983398
    Abstract: A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: September 28, 1976
    Assignee: The Board of Trustees of Leland Stanford Junior University
    Inventor: Douglas P. Boyd
  • Patent number: RE30947
    Abstract: A fan-shaped beam of penetrating radiation, such as X-ray or .gamma.-ray radiation, is directed through a slice of the body to be analyzed to a position sensitive detector for deriving a shadowgraph of transmission or absorption of the penetrating radiation by the body. A number of such shadowgraphs are obtained for different angles of rotation of the fan-shaped beam relative to the center of the slice being analyzed. The detected fan beam shadowgraph data is reordered into shadowgraph data corresponding to sets of parallel paths of radiation through the body. The reordered parallel path shadowgraph data is then convoluted in accordance with a 3-D reconstruction method by convolution in a computer to derive a 3-D reconstructed tomograph of the body under analysis. In a preferred embodiment, the position sensitive detector comprises a multiwire detector wherein the wires are arrayed parallel to the direction of the divergent penetrating rays to be detected.
    Type: Grant
    Filed: February 5, 1980
    Date of Patent: May 25, 1982
    Assignee: Stanford University
    Inventor: Douglas P. Boyd