Patents by Inventor Graham L. Matthews

Graham L. Matthews 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).

  • Monitoring by adsorption
    Patent number: 4636227
    Abstract: A passive monitor for very low concentrations of organic contaminant vapors in an atmosphere uses a holder having a first sampling chamber exposable to the atmosphere and a second desorption chamber and a charge of adsorbent. In one position of the holder, the adsorbent occupies the sampling chamber and upon changing position, the adsorbent occupies the desorption chamber.
    Type: Grant
    Filed: December 17, 1984
    Date of Patent: January 13, 1987
    Assignee: Coal Industry (Patents) Limited
    Inventors: Candido C. Yin, Graham L. Matthews