Patents by Inventor Robert Donald Plowdrey

Robert Donald Plowdrey 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 receiver with underpass detector
    Patent number: 5930693
    Abstract: A radio receiver avoids overshoot or undershoot of its audio output caused by inadequate AGC loop response when driving under an underpass and then back into an unobstructed environment. The AGC loop response time is changed upon detection of the sudden decrease in signal level when entering the underpass. The state of the AGC loop prior to entry into the underpass is stored. Upon exiting the underpass, the stored values are restored so that a proper reception level is immediately obtained.
    Type: Grant
    Filed: February 3, 1997
    Date of Patent: July 27, 1999
    Assignee: Ford Motor Company
    Inventors: John Francis Kennedy, Robert Donald Plowdrey, James Alfred Wargnier
  • Matching transformer for dual-band radio receiver
    Patent number: 5742897
    Abstract: A dual-band radio receiver utilizes a single transformer to provide impedance matching between signal mixers from separate signal paths to their respective intermediate frequency filters. Thus, a dual-band radio receiver can be made eliminating one transformer and the printed circuit board space of one transformer. In addition, only one transformer needs to be frequency aligned or adjusted during manufacturing.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: April 21, 1998
    Assignee: Ford Global Technologies, Inc.
    Inventors: Robert Donald Plowdrey, Robert Carl Beier, Yao Hsien Kuo