Patents by Inventor Li-Chung Chao

Li-Chung Chao 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).

  • Patent number: 5540242
    Abstract: The present invention incorporates film forming additives to modify cigarette paper in such a fashion as to reduce sidestream smoke. The sidestream smoke reduction paper includes an alginate as a film forming agent used in combination with a burn additive to form a coating to reduce visible sidestream smoke as compared to a control paper without the additives. The alginates include ammonium alginate, sodium alginate, and potassium alginate. The preferred burn additives include alkali metal salts, particularly alkali metal carboxylates, which include potassium succinate, potassium citrate, potassium acetate, sodium succinate, sodium citrate, and sodium acetate, added to the cigarette paper in combination with the film forming agents. An acid may be used in combination with a burn additive to form a precoat solution applied to the cigarette wrapping paper preceding the addition of a film forming agent.
    Type: Grant
    Filed: July 7, 1993
    Date of Patent: July 30, 1996
    Assignee: Brown & Williamson Tobacco Corporation
    Inventors: Li-Chung Chao, Jiunn-Yang Tang, Frank K. St. Charles, Steven Houpt
  • Patent number: 5094253
    Abstract: A dye for coloring cigarette paper a brown color which includes caramel as the brown coloring agent, a plasticizer to prevent the paper from becoming brittle, and water. The dye can further include carmine as a red coloring agent to change the shade and hue of the brown color of the caramel. The dye can further include a burn additive to promote the burning of the dyed paper if needed.
    Type: Grant
    Filed: January 5, 1990
    Date of Patent: March 10, 1992
    Assignee: Brown & Williamson Tobacco Corporation
    Inventors: Frank K. St. Charles, John H. Lauterbach, Li-Chung Chao, Jiunn-Yann Tang, Baran B. Chakraborty, Andrew McMurtrie
  • Patent number: 5090426
    Abstract: A smoking article comprising a cylinder of a first fuel, and a sleeve of a second fuel concentrically surrounding and longitudinally coextensive with the cylinder. A filter plug is coaxially located at one end of the sleeve and a seal is located at the interface of the filter and sleeve. In another embodiment, a tube is coaxially located at one end of the sleeve to define a chamber, and a filter is coaxially located at one end of the tube.
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: February 25, 1992
    Assignee: Brown & Williamson Tobacco Corporation
    Inventors: Jiunn-Yann Tang, Li-Chung Chao
  • Patent number: 5038804
    Abstract: A smoking device having a cylindrical fuel rod circumscribed by an air impermeable wrapper. The fuel rod consists of a homogeneous mixture of a non-tobacco fuel, a non-combustible tobacco, an aerosol generating material and a heat sink material.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: August 13, 1991
    Assignee: Brown & Williamson Tobacco Corporation
    Inventors: Li-Chung Chao, Jiunn-Yann Tang
  • Patent number: 4405732
    Abstract: Nylon polymer compositions are rendered flame retardant by incorporating therein an effective flame retardant amount of a salt of 2,5-dimercapto-1,3,4-thiadiazole and a metal from the group consisting of Zn, Mn, Ba, Ni, Co, Fe, Cu, Mo, and Cr.
    Type: Grant
    Filed: March 15, 1982
    Date of Patent: September 20, 1983
    Assignee: Occidental Chemical Corporation
    Inventors: Li-Chung Chao, Daniel J. Scharf