Patents by Inventor Curt R. Enzell

Curt R. Enzell 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).

  • Filter for tobacco smoke
    Patent number: 4033362
    Abstract: The present invention relates to a new type of filter for tobacco smoke, which filter has a diffusion portion, in which the smoke stream is separated from the outer air by means of a membrane, which is permeable to low molecular smoke constituents.
    Type: Grant
    Filed: February 26, 1975
    Date of Patent: July 5, 1977
    Assignees: Svenska Tobaks AB, F.J. Burrus & Cie
    Inventors: Sven-Olof Almqvist, Curt R. Enzell, Lasse O. Hjern, Antoine Artho, Robert Koch