Patents by Inventor Peter Dowson

Peter Dowson 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).

  • Method and apparatus for locating a buried element of inductive material using probe with detector coils
    Patent number: 5554934
    Abstract: After having used a known locator and a known transmitter of an electromagnetic field to find the general line of an element such as a pipe 14, the transmitter is kept activated and a probe is used having a linear coil 32 on its tip 30 which lies with its axis parallel to the length of the tip. The probe includes a display and the probe is inserted in the ground and rocked to and fro to determine when the coil is in a minimum current condition. The probe is inserted further and the same procedure repeated. Eventually the probe contacts the pipe and lies in a radial plane with respect to the pipe.
    Type: Grant
    Filed: May 10, 1995
    Date of Patent: September 10, 1996
    Assignee: British Gas plc
    Inventors: Peter Ward, Peter Dowson, John Wilkinson