Patents by Inventor Charles W. Stewart, Sr.

Charles W. Stewart, Sr. 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).

  • Copolymers of maleic anhydride or acid and fluorinated oleffins
    Patent number: 6423798
    Abstract: Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: July 23, 2002
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Clayton Wheland, Paul Douglas Brothers, Colin Anolick, Charles W. Stewart, Sr.
  • Copolymers of maleic anhydride or acid and fluorinated olefins
    Patent number: 6228963
    Abstract: Novel copolymers of fluorinated olefins and maleic anhydride, maleic acid, dichloromaleic anhydride or dichloromaleic acid may be made by using as solvents for the maleic anhydride or acid a perfluorinated alkyl carboxylic acid, or liquid or supercritical hexafluoropropylene or carbon dioxide. The resulting polymers are useful as adhesives or compatibilizing agents for fluoropolymers, and in coatings.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: May 8, 2001
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Robert Clayton Wheland, Paul Douglas Brothers, Colin Anolick, Charles W. Stewart, Sr.
  • Upholstered furniture having improved flame resistance
    Patent number: 4294489
    Abstract: Flame resistance of upholstered furniture is significantly improved by interposing between the cover fabric and the padding or applying to the top side of the cover fabric a layer of neoprene foam capable of forming when exposed to a burning cigarette or under the conditions of a standard flame spread test, a thermally insulating char which does not smolder, and which maintains its structural integrity. The neoprene foam must be so formulated that it also is capable of evolving at combustion temperature sufficient amount of water to efficiently cool the affected area. Normally, the latex from which the foam is prepared is formulated with a char promoter and a hydrated inorganic compound. Upholstered furniture of this invention passes a burning cigarette test and performs extremely well in the flame spread test.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: October 13, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Colin Anolick, Vivian M. Robinson, Charles W. Stewart, Sr.
  • Upholstered furniture having improved flame resistance
    Patent number: 4174420
    Abstract: Flame resistance of upholstered furniture is significantly improved by interposing between the cover fabric and the padding or applying to the top side of the cover fabric a layer of neoprene foam capable of forming when exposed to a burning cigarette or under the conditions of a standard flame spread test, a thermally insulating char which does not smolder, and which maintains its structural integrity. The neoprene foam must be so formulated that it also is capable of evolving at combustion temperature sufficient amount of water to efficiently cool the affected area. Normally, the latex from which the foam is prepared is formulated with a char promoter and a hydrated inorganic compound. Upholstered furniture of this invention passes a burning cigarette test and performs extremely well in the flame spread test.
    Type: Grant
    Filed: April 29, 1975
    Date of Patent: November 13, 1979
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Colin Anolick, Vivian M. Robinson, Charles W. Stewart, Sr.