Patents by Inventor James E. Demaree

James E. Demaree 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).

  • Helium smoke generator
    Patent number: 4994092
    Abstract: A smoke generator which generates cold smoke having the buoyant properties of smoke produced by a fire. The density of the smoke can be varied to simulate any desired fire plume temperature by adding helium or other lighter than air gas to it. This produces a smoke which rises and spreads just like the smoke from a fire but without requiring that a fire be used to produce the smoke.
    Type: Grant
    Filed: June 27, 1989
    Date of Patent: February 19, 1991
    Assignee: The United States of America as represented by the Secretary of Transportation
    Inventors: Thor I. Eklund, James E. Demaree, William E. Neese