Patents by Inventor Paul David Case

Paul David Case 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: 6595217
    Abstract: Cigarette filter rod employs as filtration material moisture disintegrative paper. The moisture disintegration index of the paper does not exceed 20.
    Type: Grant
    Filed: November 1, 1995
    Date of Patent: July 22, 2003
    Assignee: British-American Tobacco Company Limited
    Inventors: Paul David Case, Martin Coleman
  • Smoking articles
    Patent number: 6478032
    Abstract: The invention relates to a cigarette paper having a low total filler content, 20% by weight of the paper or less, a proportion of the filler being a filler capable of effecting visible sidestream smoke reduction. The basis weight of the paper is about 30 g m−2 or more. Smoking articles made with such papers provide a synergistic sidestream smoke component reduction when compared with control cigarettes. Papers according to the invention with the addition of various burn additives are also described.
    Type: Grant
    Filed: October 18, 1999
    Date of Patent: November 12, 2002
    Assignee: British-American Tobacco (Investments) Limited
    Inventors: Paul David Case, Alan George Stephenson
  • Low filler content cigarette wrappers
    Patent number: 6161552
    Abstract: The invention relates to a cigarette paper having a low total filler content, 20% by weight of the paper or less, a proportion of the filler being a filler capable of effecting visible sidestream smoke reduction. The basis weight of the paper is about 30 g m.sup.-2 or more.Smoking articles made with such papers provide a synergistic sidestream smoke component reduction when compared with control cigarettes. Papers according to the invention with the addition of various burn additives are also described.
    Type: Grant
    Filed: December 30, 1991
    Date of Patent: December 19, 2000
    Assignee: British-American Tobacco Company Limited
    Inventors: Paul David Case, Alan George Stephenson
  • Smoking articles
    Patent number: 6000404
    Abstract: The invention relates to a cigarette paper having a low total filler content, 20% by weight of the paper or less, a proportion of the filler being a filler capable of effecting visible sidestream smoke reduction. The basis weight of tbh paper is about 30 g m.sup.-2 or more.Smoking articles made with such papers provide a synergistic sidestream smoke component reduction when compared with control cigarettes. Papers according to thee invention with the addition of various burn additives are also described.
    Type: Grant
    Filed: February 26, 1998
    Date of Patent: December 14, 1999
    Assignee: British American Tobacco (Investments) Limited
    Inventors: Paul David Case, Alan George Stephenson
  • Tobacco smoke filtration material
    Patent number: 5958327
    Abstract: The invention relates to a method and apparatus for the downstream handling of water soluble polysaccharide-containing extruded tobacco smoke filtration material. During conveying of the extrudate from the extruder die of an extruder to a cutter, the extrudate is heated, shaped, and cooled to provide tobacco smoke filtration material of desired dimensions and physical characteristics.
    Type: Grant
    Filed: October 16, 1996
    Date of Patent: September 28, 1999
    Assignee: British-American Tobacco Company Limited
    Inventors: John Lawson Beven, Paul David Case, Martin Coleman, Colin Campbell Greig
  • Filtration materials
    Patent number: 5954059
    Abstract: An extruded filtration material which is degradable and comprises either a plastics material or an inorganic material having a melting point above the operating temperature, a polysaccharide expansion medium, a binder and water. These ingredients are fed to an extruder and subjected to an extrusion process which involves a pressure reduction, upon extrusion from the exit die, of up to about 70 bars so that swelling of the extrudate occurs to give a cellular structure. When exposed to the natural weather conditions, tobacco smoke filter elements comprising such material degrade without leaving a fused amalgamation of plastics or inorganic material.
    Type: Grant
    Filed: March 8, 1994
    Date of Patent: September 21, 1999
    Assignee: British-American Tobacco Company Limited
    Inventors: John Lawson Beven, Paul David Case, Martin Coleman, Colin Campbell Greig, Peter Rex White