Patents by Inventor David Eugene Johnson

David Eugene Johnson 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).

  • Method and apparatus to minimize gradient errors in buried utility depth measurements
    Patent number: 8878537
    Abstract: A buried utility locator uses the “gradient method” to determine the depth of a buried, current-carrying utility. The method and corresponding apparatus used in said locator, to minimize field gradient measurement errors, includes first and second antennas. Both the first and second antennas are mounted along a common vertical axis inside the locator's housing. The first antenna is a gradiometer formed by two vertically spaced-apart magnetic field sensors connected in a differential configuration. The second antenna provides a secondary field measurement along the direction of the gradient sensor axes.
    Type: Grant
    Filed: June 3, 2011
    Date of Patent: November 4, 2014
    Assignee: First Texas Products, LLC
    Inventors: David Eugene Johnson, Ross Edward Spain
  • Multi-axial fabric
    Patent number: D1023593
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: April 23, 2024
    Assignee: Nicolon Corporation
    Inventors: David Michael Jones, Randall Eugene Johnson, Michael D. Samueloff