Patents by Inventor Gretchen H. Hefley

Gretchen H. Hefley 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).

  • Radio frequency signals detection systems
    Patent number: 11962079
    Abstract: The embodiments include an array in intimate adjacent contact with a substrate foundation. The array has a plurality of radio frequency (RF) witness films overlain on the substrate foundation. Each RF witness film is a unit cell defined in a three-dimensional coordinate frame of reference, and is centered at an origin of the three-dimensional coordinate frame of reference. Each RF witness film in the plurality of RF witness films is equally-spaced from adjacent RF witness films.
    Type: Grant
    Filed: January 25, 2022
    Date of Patent: April 16, 2024
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Zachary A. Sechrist, Christopher G. Yelton, Mark B. Moran, Linda F Johnson, Joseph E. Estevez, Gretchen H. Hefley
  • Radio frequency witness film apparatus and system
    Patent number: 11764466
    Abstract: The embodiments are directed to radio frequency witness films. The embodiments include a unit cell in a three-dimensional coordinate frame of reference defined by an x-axis, a y-axis, and a z-axis. The unit cell is centered at an origin of the three-dimensional coordinate frame of reference. The unit cell includes a substrate, a first conductive layer, a dielectric layer, and a second conductive layer. The second conductive layer has at least two microstrip extensions that are perpendicular to each other in the x-y plane.
    Type: Grant
    Filed: January 25, 2022
    Date of Patent: September 19, 2023
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Zachary A. Sechrist, Christopher G. Yelton, Mark B. Moran, Linda F. Johnson, Joseph E. Estevez, Gretchen H. Hefley