Patents by Inventor David W. Purnhagen

David W. Purnhagen 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).

  • Dynamic wide-area earth thermal properties and earth ambient temperature determination system
    Patent number: 9638586
    Abstract: Techniques are described for generating earth sub-surface thermal characteristics over an area include collecting real-time weather data and earth data for a plurality of locations associated with an underground electrical cable and calculating earth thermal properties at the plurality of locations based on the real-time weather data and the measured earth data by an iterative process. The calculated earth thermal properties at two or more of the plurality of locations are interpolated to determine interpolated earth thermal properties at another location associated with the underground electrical cable and a wide-area thermal property map created from at least some of the calculated earth thermal properties and the interpolated earth thermal properties.
    Type: Grant
    Filed: March 4, 2014
    Date of Patent: May 2, 2017
    Assignee: Underground Systems, Inc.
    Inventors: David W. Purnhagen, Chunchuan Xu, Paul A. Alex
  • DYNAMIC WIDE-AREA EARTH THERMAL PROPERTIES AND EARTH AMBIENT TEMPERATURE DETERMINATION SYSTEM
    Publication number: 20150253458
    Abstract: Techniques are described for generating earth sub-surface thermal characteristics over an area include collecting real-time weather data and earth data for a plurality of locations associated with an underground electrical cable and calculating earth thermal properties at the plurality of locations based on the real-time weather data and the measured earth data by an iterative process. The calculated earth thermal properties at two or more of the plurality of locations are interpolated to determine interpolated earth thermal properties at another location associated with the underground electrical cable and a wide-area thermal property map created from at least some of the calculated earth thermal properties and the interpolated earth thermal properties.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 10, 2015
    Applicant: Underground Systems, Inc.
    Inventors: David W. Purnhagen, Chunchuan Xu, Paul A. ALEX