Patents by Inventor David J. Dittrich

David J. Dittrich 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).

  • Smoking articles
    Patent number: 5249588
    Abstract: A smoking article which comprises tobacco treated with a high loading level of humectant and which has been expanded by a high level expansion process to produce expanded tobacco having a humectant loading level in the range of 4% to 15%. The particulate matter, water, nicotine and humectant free (PMWNHF) to nicotine delivery ratio of smoking articles according to the invention and smoked under standard machine smoking conditions is not more than 8 to 1.
    Type: Grant
    Filed: November 21, 1991
    Date of Patent: October 5, 1993
    Assignee: British-American Tobacco Company Limited
    Inventors: Ian C. Brown, David J. Dittrich, Richard T. Fiebelkorn
  • Smoking articles
    Patent number: 4964427
    Abstract: Low sidestream cigarettes comprise at least 20% expanded tobacco and a cigarette paper comprising a burn retardant.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: October 23, 1990
    Assignee: British-American Tobacco Company, Ltd.
    Inventors: Paul D. Case, David J. Dittrich
  • Smoking articles
    Patent number: 4878507
    Abstract: Low sidestream cigarettes comprise at least 20% expanded tobacco and cigarette paper of an air permeability of not more than 20 Coresta units, the tobacco density being between 100 and 260 mg cm.sup.-3.
    Type: Grant
    Filed: September 2, 1988
    Date of Patent: November 7, 1989
    Assignee: British-American Tobacco Company, Ltd.
    Inventors: Paul D. Case, David J. Dittrich
  • Smoking articles
    Patent number: 4607647
    Abstract: The smoking articles, such as cigarettes, comprise smoking material wrapped in a low side stream wrapper paper incorporating or being coated with a stain resist substance, such as EVA (ethylene vinyl acetate).
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: August 26, 1986
    Assignee: British-American Tobacco Company Limited
    Inventors: Frederick J. Dashley, David J. Dittrich