Patents by Inventor David R. Madeley

David R. Madeley 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).

  • Device depowering apparatus
    Patent number: 5008561
    Abstract: A depowering apparatus for controlling selection and deselection of devices, such as a pair of torque motors, comprises two channels. Each channel has a normally open switch in series with a normally closed switch connecting a power supply line to the torque motor. A control circuit in each channel closes the normally open switch of that channel and opens the normally closed switch of the other channel in response to a channel select signal so as to ensure that each of the torque motors can be depowered to allow the other to take control.
    Type: Grant
    Filed: March 13, 1990
    Date of Patent: April 16, 1991
    Assignee: Lucas Industries
    Inventors: David R. Madeley, Mark S. Binet
  • Temperature compensated resistance bridge circuit
    Patent number: 4611163
    Abstract: A resistance bridge is temperature-compensated to provide acceptable values of sensitivity error and zero input error, by using a temperature-responsive current source from which are derived voltages which modify the bridge supply voltage and the bridge output voltage respectively. The output voltage is also modified to provide an acceptable sensitivity error by means of resistors in a circuit between output connections of the bridge and an output connection of the arrangement as a whole.
    Type: Grant
    Filed: February 25, 1985
    Date of Patent: September 9, 1986
    Assignee: Lucas Industries
    Inventor: David R. Madeley