Patents by Inventor David B. Pedersen

David B. Pedersen 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).

  • Respirator end-of-service life probe
    Patent number: 7894069
    Abstract: An end-of-service life indicator for a sorbent filter includes a tube containing a noble metal nanoparticle film on an optically transparent substrate, the substrate being perpendicular to the axis of the tube. An opening in the tube adjacent to the film allows chemical vapor to accumulate in the tube and be absorbed by the film. A light source located at one end of the tube and a light detector at the other end determines the amount of light absorbed by the nanoparticle film due to exposure to chemical vapor. A signal from the light detector is applied to an electronic processor that determines attenuation of light by the film, and the processor is connected to an indicator to provide an indication of the exposure of the film to the vapor.
    Type: Grant
    Filed: April 9, 2008
    Date of Patent: February 22, 2011
    Assignee: Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence of Her Majesty's Canadian Government
    Inventors: E. J. Scott Duncan, David B. Pedersen
  • Respirator end-of-service life probe
    Publication number: 20100284010
    Abstract: An end-of-service life indicator for a sorbent filter includes a tube containing a noble metal nanoparticle film on an optically transparent substrate, the substrate being perpendicular to the axis of the tube. An opening in the tube adjacent to the film allows chemical vapor to accumulate in the tube and be absorbed by the film. A light source located at one end of the tube and a light detector at the other end determines the amount of light absorbed by the nanoparticle film due to exposure to chemical vapor. A signal from the light detector is applied to an electronic processor that determines attenuation of light by the film, and the processor is connected to an indicator to provide an indication of the exposure of the film to the vapor.
    Type: Application
    Filed: April 9, 2008
    Publication date: November 11, 2010
    Inventors: E.J. Scott Duncan, David B. Pedersen