Patents by Inventor David Thomas Engquist

David Thomas Engquist 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: 12571816
    Abstract: A cable assembly has a connector to receive a signal, a cable connected to the connector, the cable having a length and one or more conductors along at least part of the length to conduct the signal, a magnetic material external to the one or more conductors, and an elastomer material external to the one or more conductors. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, one or more discrete magnetic components spaced along the length of the cable, and one or more elastomer components next to at least one of the one or more magnetic components. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, an elastomer material at least partially enclosing the cable, and a magnetic material at least partially enclosing the cable.
    Type: Grant
    Filed: October 3, 2023
    Date of Patent: March 10, 2026
    Assignee: Tektronix, Inc.
    Inventors: Julie A. Campbell, David M. Ediger, Daniel G. Knierim, David Thomas Engquist
  • Patent number: 12372550
    Abstract: A probe tip for an isolated probe having a triaxial cable has a conductive probe tip interface at one end of the cable, a signal conductor, the signal conductor traversing a length of the cable and electrically connected to the conductive probe tip interface, a reference conductor surrounding the signal conductor along the length of the cable, a shield conductor surrounding the reference conductor at least along the length of the cable, the shield conductor and the reference conductor electrically connected at ends of the probe tip, a first insulator between the signal conductor and the reference conductor along the length of the cable, a second insulator between the reference conductor and the shield conductor along the length of the cable, and high magnetic permeability material inside the shield conductor.
    Type: Grant
    Filed: April 26, 2022
    Date of Patent: July 29, 2025
    Inventors: Daniel G. Knierim, Josiah A. Bartlett, Andrew W. Rusinek, David Thomas Engquist
  • Patent number: 12332277
    Abstract: A thermal management system for a test-and-measurement probe that includes a thermally insulated shroud and a fluid inlet conduit. The shroud is configured to enclose a first portion of a test-and-measurement probe within an interior cavity of the shroud, while permitting a second portion of the test-and-measurement probe head to extend out of the shroud into a testing environment. The shroud further includes a fluid outlet passageway configured to permit a heat-transfer fluid to pass from a probe-head end of the interior cavity, through the interior cavity of the shroud, and out of the shroud through an access portion of the shroud. A fluid inlet conduit enters the shroud through an access portion of the shroud, extends through the interior cavity of the shroud, and is configured to introduce a heat-transfer fluid to a probe-head portion of the test-and-measurement probe.
    Type: Grant
    Filed: January 23, 2023
    Date of Patent: June 17, 2025
    Assignee: Tektronix, Inc.
    Inventors: Matthew J. Hull, Julie A. Campbell, David Thomas Engquist
  • Publication number: 20240118336
    Abstract: A customizable safety enclosure for a device under test (DUT) includes a plurality of non-conductive panels to enclose the DUT, and a plurality of non-conductive removeable corner joints each configured to secure a corner of the enclosure. A method of supplying a customized safety enclosure for a DUT to a customer includes receiving information from the customer about the DUT size and testing environment, fabricating one or more variable components of the enclosure, producing custom assembly instructions for the enclosure, packaging a plurality of components of the enclosure including the variable components and one or more fixed components, and sending the package of components and the custom assembly instructions to the customer.
    Type: Application
    Filed: October 11, 2023
    Publication date: April 11, 2024
    Applicant: Tektronix, Inc.
    Inventor: David Thomas Engquist
  • Publication number: 20240118314
    Abstract: A cable assembly has a connector to receive a signal, a cable connected to the connector, the cable having a length and one or more conductors along at least part of the length to conduct the signal, a magnetic material external to the one or more conductors, and an elastomer material external to the one or more conductors. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, one or more discrete magnetic components spaced along the length of the cable, and one or more elastomer components next to at least one of the one or more magnetic components. A cable assembly has a connector to receive a differential signal, a cable connected to the connector having symmetric pair conductors, an elastomer material at least partially enclosing the cable, and a magnetic material at least partially enclosing the cable.
    Type: Application
    Filed: October 3, 2023
    Publication date: April 11, 2024
    Applicant: Tektronix, Inc.
    Inventors: Julie A. Campbell, David M. Ediger, Daniel G. Knierim, David Thomas Engquist
  • Patent number: 11578925
    Abstract: A thermal management system for a test-and-measurement probe that includes a thermally insulated shroud and a fluid inlet conduit. The shroud is configured to enclose a first portion of a probe head of the probe within an interior cavity of the shroud, while permitting a second portion of the probe head to extend out of the shroud. The shroud further includes a fluid outlet passageway configured to permit a heat-transfer fluid to pass from a probe-head end of the interior cavity, through the interior cavity of the shroud, and out of the shroud through an access portion of the shroud. The fluid inlet conduit enters the shroud through the access portion of the shroud, extends through the interior cavity of the shroud, and is configured to introduce the heat-transfer fluid to the probe-head end of the interior cavity.
    Type: Grant
    Filed: November 12, 2020
    Date of Patent: February 14, 2023
    Assignee: Tektronix, Inc.
    Inventors: Julie A. Campbell, David Thomas Engquist, Sam J. Strickling
  • Publication number: 20220349917
    Abstract: A probe tip for an isolated probe having a triaxial cable has a conductive probe tip interface at one end of the cable, a signal conductor, the signal conductor traversing a length of the cable and electrically connected to the conductive probe tip interface, a reference conductor surrounding the signal conductor along the length of the cable, a shield conductor surrounding the reference conductor at least along the length of the cable, the shield conductor and the reference conductor electrically connected at ends of the probe tip, a first insulator between the signal conductor and the reference conductor along the length of the cable, a second insulator between the reference conductor and the shield conductor along the length of the cable, and high magnetic permeability material inside the shield conductor.
    Type: Application
    Filed: April 26, 2022
    Publication date: November 3, 2022
    Applicant: Tektronix, Inc.
    Inventors: Daniel G. Knierim, Josiah A. Bartlett, Andrew W. Rusinek, David Thomas Engquist
  • Publication number: 20210148640
    Abstract: A thermal management system for a test-and-measurement probe that includes a thermally insulated shroud and a fluid inlet conduit. The shroud is configured to enclose a first portion of a probe head of the probe within an interior cavity of the shroud, while permitting a second portion of the probe head to extend out of the shroud. The shroud further includes a fluid outlet passageway configured to permit a heat-transfer fluid to pass from a probe-head end of the interior cavity, through the interior cavity of the shroud, and out of the shroud through an access portion of the shroud. The fluid inlet conduit enters the shroud through the access portion of the shroud, extends through the interior cavity of the shroud, and is configured to introduce the heat-transfer fluid to the probe-head end of the interior cavity.
    Type: Application
    Filed: November 12, 2020
    Publication date: May 20, 2021
    Applicant: Tektronix, Inc.
    Inventors: Julie A. Campbell, David Thomas Engquist, Sam J. Strickling
  • Patent number: 10228390
    Abstract: Embodiments of the present invention provide an improved cable assembly for connecting an electrical test and measurement probe to a device under test. One end of the probe is connected to a device under test (“DUT”), while the other end is connected to the instrument through one or more cables. To prevent mechanical stresses to the probe-DUT interface caused by the cables' resistance to bending and twisting, embodiments of the improved cable assembly use one or more pliable spines to hold the cable assembly in position after it has been bent or twisted. This provides a more secure connection to the DUT and prevents damage to the probe-DUT interface. Each spine is anchored to the tip of the probe, and may be further secured by an outer housing or additional anchors. A flexible boot may surround the cable assembly and/or outer housing, further protecting the cables from damage. Alternatively, one or more spines may be placed inside the boot.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: March 12, 2019
    Assignee: Tektronix, Inc.
    Inventors: James H. McGrath, Jr., David Thomas Engquist
  • Publication number: 20170045550
    Abstract: Embodiments of the present invention provide an improved cable assembly for connecting an electrical test and measurement probe to a device under test. One end of the probe is connected to a device under test (“DUT”), while the other end is connected to the instrument through one or more cables. To prevent mechanical stresses to the probe-DUT interface caused by the cables' resistance to bending and twisting, embodiments of the improved cable assembly use one or more pliable spines to hold the cable assembly in position after it has been bent or twisted. This provides a more secure connection to the DUT and prevents damage to the probe-DUT interface. Each spine is anchored to the tip of the probe, and may be further secured by an outer housing or additional anchors. A flexible boot may surround the cable assembly and/or outer housing, further protecting the cables from damage. Alternatively, one or more spines may be placed inside the boot.
    Type: Application
    Filed: August 11, 2015
    Publication date: February 16, 2017
    Inventors: James H. McGrath, JR., David Thomas Engquist
  • Patent number: D947693
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: April 5, 2022
    Assignee: Tektronix, Inc.
    Inventors: David Thomas Engquist, Heather J. Vermilyea, Karl A. Rinder, Michael J. Mende, Tony Lee Tarr
  • Patent number: D992437
    Type: Grant
    Filed: March 29, 2022
    Date of Patent: July 18, 2023
    Assignee: Tektronix, Inc.
    Inventors: David Thomas Engquist, Heather J. Vermilyea, Karl A. Rinder, Michael J. Mende, Tony Lee Tarr
  • Patent number: D1116879
    Type: Grant
    Filed: September 7, 2022
    Date of Patent: March 10, 2026
    Assignee: TEKTRONIX, INC.
    Inventor: David Thomas Engquist