Patents by Inventor David Duerden

David Duerden 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).

  • Detection of ultraviolet radiation
    Patent number: 4904876
    Abstract: A device for detecting ultraviolet radiation comprises a measuring head (101) to receive the ultraviolet radiation and comprising a filter (112) which emits fluorescent light in an amount dependent on the amount of ultraviolet radiation. The fluorescent light emitted is monitored to obtain a measure of the amount of ultraviolet radiation. A means (115) may be included to compensate for the temperature dependence of the filter.
    Type: Grant
    Filed: April 29, 1988
    Date of Patent: February 27, 1990
    Assignee: Thomas Swan & Co., Ltd.
    Inventors: James H. Nobbs, Peter K. T. Oldring, David Duerden
  • Apparatus for the solidification of liquid films
    Patent number: 4799453
    Abstract: The solidification characteriztics of a solidifiable liquid film are monitored by effecting relative movement between a stylus and the film and monitoring the resistance to movement of the stylus through the film as the film is solidifying. The film may be subjected to ultraviolet radiation or elevated temperature to cause solidification. The resistance to movement may be monitored electrically in which case it may be recorded as a trace or a chart recorder.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: January 24, 1989
    Assignee: Thomas Swan & Co., Ltd.
    Inventors: James H. Nobbs, Peter K. T. Oldring, David Duerden