Patents by Inventor David Anthony Ladds

David Anthony Ladds 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).

  • Electricity measurement using two conductors
    Patent number: 6040690
    Abstract: An electricity measurement apparatus includes two spaced-apart parallel conductors through which current flows in the same direction inducing a magnetic field between the conductors. Two magnetic field sensors are disposed on each side of a first plane in which the conductors lie. The sensors are in a second plane that is substantially between the conductors and perpendicular to the first plane. An arithmetic processor processes signals from the sensors to provide a value representative of current flow. The provided value is substantially independent of the position of the second plane within the space between the conductors.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: March 21, 2000
    Assignee: Horstmann Timers & Controls Limited
    Inventor: David Anthony Ladds