Patents by Inventor Ian David Roffey

Ian David Roffey 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).

  • Smoke generator
    Patent number: 6347188
    Abstract: A smoke generator in which a supply of smoke making fluid is caused to pass cyclically down tubing (20). In a heat exchanger, an electrical current is passed along the tubing to heat the tubing and a sensor (54) is arranged to sense the tube temperature. Electrical power is controlled to heat the tubing cyclically so that fluid in the tubing is burnt off, every cycle of the power being switched on or off, thus reducing clogging.
    Type: Grant
    Filed: February 9, 2000
    Date of Patent: February 12, 2002
    Assignee: Le Maitre Ltd.
    Inventor: Ian David Roffey