Patents by Inventor Christopher W. Norvall

Christopher W. Norvall 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 rod
    Patent number: 4685475
    Abstract: Cigarette rod or cigarette filter rod comprising an outer, longitudinally seamed wrapper is monitored, to detect defects in the longitudinal seam, by directing, from a nozzle, a stream of air tangentially of the rod, whereby the air flows in Coanda effect contact with the rod, and audio detecting the presence or absence of air, at a location spaced from the nozzle, in accordance with the presence or absence of a seam defect.
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: August 11, 1987
    Assignee: British-American Tobacco Company Limited
    Inventors: Keith D. Ridler, Peter J. Taylor, John Poley, Christopher W. Norvall, John Upton