Patents by Inventor Freeman D. Shepherd, Jr.

Freeman D. Shepherd, Jr. 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).

  • Self-guarding Schottky barrier infrared detector array
    Patent number: 4531055
    Abstract: A two dimensional focal plane array of Schottky photodiodes on a silicon substrate for infrared imaging. The array is designed for mating with multiplexing circuitry and has a self-guarding feature wherein adjacent Schottky electrodes act as guard electrodes. This feature allows a substantial increase of the focal plane area coverage ratio.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: July 23, 1985
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Freeman D. Shepherd, Jr., Paul W. Pellegrini, Charlotte E. Ludington, Melanie M. Weeks
  • Phase compensated zone plate photodetector
    Patent number: 4016416
    Abstract: A radiation transparent base having a number of coincentric Fresnel rings mounted on one face, and one-quarter wavelength in thickness and a reflective coating covering the face and rings and a detector mounted on the opposite face to collect reflected in phase radiation.
    Type: Grant
    Filed: March 23, 1976
    Date of Patent: April 5, 1977
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Freeman D. Shepherd, Jr., Sven A. Roosild
  • Low beam velocity retina for Schottky infrared vidicons
    Patent number: 4005327
    Abstract: A solid state sensing retina for infrared vidicon television camera tubes using a low voltage electron beam, consisting of a monolithic silicon wafer having an n-type substrate and two dimensional array of p-type islands, each island has a Schottky electrode photoemitter and substrate contact buss, an ohmic contact pad allows charging of the p-type region beneath the Schottky electrode.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: January 25, 1977
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Sven A. Roosild, Freeman D. Shepherd, Jr., Andrew C. Yang
  • Buried junction enhanced Schottky barrier device
    Patent number: H134
    Abstract: A Schottky barrier device having a completely submersed Schottky barrier junction to enhance the collection efficiency of photogenerated carriers. A method is also disclosed for manufacturing the device.
    Type: Grant
    Filed: August 22, 1984
    Date of Patent: September 2, 1986
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Lyn H. Skolnik, Sven A. Roosild, Freeman D. Shepherd, Jr.