Patents by Inventor Daniel R. Ledbetter

Daniel R. Ledbetter 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).

  • Gripping assembly for use with cable exercising equipment
    Patent number: 4756527
    Abstract: A gripping assembly adapted for use with cable-type exercising devices which employs a hand locking member for securing the assembly to the user's hand during use.
    Type: Grant
    Filed: April 14, 1987
    Date of Patent: July 12, 1988
    Inventor: Daniel R. Ledbetter
  • Passive infrared room intrusion detector
    Patent number: 3955184
    Abstract: An intrusion system detects changes in background radiation received from a plurality of orthogonally arranged fields of view (FOV) which preferably are defined by thin polyhedrons coextensive with the walls of the room. These fields of view are generated by a plurality of orthogonally arranged optical reflectors located in certain corners of the room, and any changes in background radiation within these fields of view are detected by one or more thermopile detectors which are optically aligned with the above optical reflectors. The low level - low frequency output signal voltages form the thermopile detectors are converted to an AC signal and amplified for use as an intrusion alarm signal.
    Type: Grant
    Filed: August 18, 1975
    Date of Patent: May 4, 1976
    Assignee: Hughes Aircraft Company
    Inventors: Robert J. Cinzori, Daniel R. Ledbetter