Patents by Inventor Shelle D. Tilstra

Shelle D. Tilstra 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).

  • Black body TRD temperature sensor
    Patent number: 5255980
    Abstract: A temperature sensing system has a signal means which provides a signal representative of a temperature responsive luminescence, where the luminescence has a characteristic time-rate-of-decay. A means for comparison is connected to the signal means and samples the signal during two time intervals, the first interval overlapping the second. The averages of the samples are compared to provide a difference signal representative of the difference between the two measured averages. Control means coupled to the comparison means provide an output representing the temperature as a function of the time-rate-of-decay, by adjusting the overlapping intervals so that the difference signal converges to a preselected limit.
    Type: Grant
    Filed: May 14, 1992
    Date of Patent: October 26, 1993
    Assignee: Rosemount Inc.
    Inventors: David C. Thomas, Stephen C. Jensen, Gerald R. Cucci, Charles M. Peterson, Shelle D. Tilstra, Steven J. Rychnovsky
  • TRD temperature sensor and electronics
    Patent number: 5211480
    Abstract: A temperature sensing system has a signal means which provides a signal representative of a temperature responsive luminescence, where the luminescence has a characteristic time-rate-of-decay. A means for comparison is connected to the signal means and samples the signal during two time intervals, the first interval overlapping the second. The averages of the samples are compared to provide a difference signal representative of the difference between the two measured averages. Control means coupled to the comparison means provide an output representing the temperature as a function of the time-rate-of-decay, by adjusting the overlapping intervals so that the difference signal converges to a preselected limit.
    Type: Grant
    Filed: October 18, 1990
    Date of Patent: May 18, 1993
    Assignee: Rosemount Inc.
    Inventors: David C. Thomas, Stephen C. Jensen, Gerald R. Cucci, Charles M. Peterson, Shelle D. Tilstra, Steven J. Rychnovsky