Patents by Inventor Andrew John Tedd

Andrew John Tedd 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).

  • Compact shunt for current measurement
    Patent number: 9201099
    Abstract: Conductive strips are stacked, insulated, folded, and formed into geometric shapes to provide a low resistance, low inductance, shunt, wherein the geometric shape readily enables cooling to reduce changes in resistance due to self-heating effects. One such geometric shape is attained by winding the conductive strips into a spiral. Another geometric shape is a shape resembling a wave. Both geometric shapes allow cooling by directing airflow from a fan across their surface portions. A variable-speed cooling-fan is controlled in response to measured temperature of the shunt, or in response to a measurement of the current through the shunt. Differential cooling may be employed by means of changing the amount of airflow across various portions of the shunt in response to measured temperature of the shunt.
    Type: Grant
    Filed: May 16, 2013
    Date of Patent: December 1, 2015
    Assignee: TEKTRONIX, INC.
    Inventors: Andrew John Tedd, John Stewart Ford, Lionel Ind
  • COMPACT SHUNT FOR CURRENT MEASUREMENT
    Publication number: 20140210454
    Abstract: Conductive strips are stacked, insulated, folded, and formed into geometric shapes to provide a low resistance, low inductance, shunt, wherein the geometric shape readily enables cooling to reduce changes in resistance due to self-heating effects. One such geometric shape is attained by winding the conductive strips into a spiral. Another geometric shape is a shape resembling a wave. Both geometric shapes allow cooling by directing airflow from a fan across their surface portions. A variable-speed cooling-fan is controlled in response to measured temperature of the shunt, or in response to a measurement of the current through the shunt. Differential cooling may be employed by means of changing the amount of airflow across various portions of the shunt in response to measured temperature of the shunt.
    Type: Application
    Filed: May 16, 2013
    Publication date: July 31, 2014
    Applicant: Tektronix, Inc.
    Inventors: Andrew John Tedd, John Stewart Ford, Lionel Ind