Patents by Inventor Donald W. Church

Donald W. Church 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).

  • Electronic parking meter
    Patent number: 8727207
    Abstract: A proximity detector for detecting the presence of a coin or token in a coin chute, comprising a pair of axially aligned coils disposed on opposed sides of the chute; a common-emitter amplifier having a base and a collector providing a detector output, one of the coils being connected to the collector and the other of the coils being connected to the base.
    Type: Grant
    Filed: October 23, 1997
    Date of Patent: May 20, 2014
    Assignee: J.J. MacKay Canada Limited
    Inventors: Donald W. Church, Douglas George Pincock, Theodore Gerard Bushnik, John Roderick Campbell, Gregory Emile Chauvin
  • Apparatus and method for identifying metallic tokens and coins
    Patent number: 5573099
    Abstract: A method for identifying metallic coins and tokens, comprising: applying an input signal to an ac-bridge; bringing a coin/token in the vicinity of one arm of the ac-bridge; sensing an output signal of the ac-bridge; and associating the output signal with presence of the coin/token in the vicinity of the arm of the ac-bridge.
    Type: Grant
    Filed: January 12, 1995
    Date of Patent: November 12, 1996
    Assignee: J. J. Mackay Canada Limited
    Inventors: Donald W. Church, Ove K. Gashus
  • Encapsulated microelectronic heart monitor
    Patent number: 4753244
    Abstract: Self-contained, micro-electronic heart monitor for mounting on or near the heart during surgery, to monitor the electrical activity of the heart during cardioplegic arrest by picking up and amplifying electrical signals from the heart and displaying an output when the signal exceeds a threshold level.
    Type: Grant
    Filed: July 16, 1987
    Date of Patent: June 28, 1988
    Inventors: Roderick W. Landymore, Allan E. Marble, Donald W. Church