Patents by Inventor Craig B. Christensen

Craig B. Christensen 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).

  • Sensor with antifouling control
    Patent number: 8429952
    Abstract: A probe with antifouling components. The probe includes a sensor for measuring attributes of a fluid such as liquid or gas. The probe includes antifouling components to prevent or inhibit fouling. The antifouling components include material components, antifoulant components such as biocide, scaling inhibitors, etc., and wiper/shutter components that are arranged to collectively prevent or inhibit fouling of the probe or of the sensor included in the probe.
    Type: Grant
    Filed: February 2, 2010
    Date of Patent: April 30, 2013
    Assignee: Campbell Scientific, Inc.
    Inventors: Boyd T. Bringhurst, Craig B. Christensen, Daniel W. Ewert, R. Joseph Thurston, John P. Downing, Jr.
  • Unglazed transpired solar collector having a low thermal-conductance absorber
    Patent number: 5692491
    Abstract: An unglazed transpired solar collector using solar radiation to heat incoming air for distribution, comprising an unglazed absorber formed of low thermal-conductance material having a front surface for receiving the solar radiation and openings in the unglazed absorber for passage of the incoming air such that the incoming air is heated as it passes towards the front surface of the absorber and the heated air passes through the openings in the absorber for distribution.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: December 2, 1997
    Assignee: Midwest Research Institute
    Inventors: Craig B. Christensen, Charles F. Kutscher, Keith M. Gawlik