Patents by Inventor Wilfred Sweeny

Wilfred Sweeny 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).

  • Silver-plated fibers of poly(p-phenylene terephthalamide) and a process for making them
    Patent number: 5549972
    Abstract: Silver-plated aramid fibers are disclosed having a core of sulfonated aramid, an outer layer of continuous silver, and a zone of impregnation therebetween made up of domains of silver metal dispersed in a matrix of sulfonated aramid; and a process for making such fibers.
    Type: Grant
    Filed: May 8, 1995
    Date of Patent: August 27, 1996
    Assignee: E. I. Du Pont de Nemours & Company
    Inventors: Che-Hsiung Hsu, Wilfred Sweeny
  • Polybenzobisthiazole and polybenzobisoxazole fibers of improved compressive properties
    Patent number: 5100434
    Abstract: Crosslinking of polybenzobisthiazole and polybenzobisoxazole in fiber formed by thermal elimination of halogen raises the compressive properties.
    Type: Grant
    Filed: January 8, 1991
    Date of Patent: March 31, 1992
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Process for preparing melt-processible aromatic polyamides with alkali metal fluoride catalyst
    Patent number: 5077377
    Abstract: A process is provided for the production of a novel melt-processible aromatic polyamide having a Tg >150.degree. C.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: December 31, 1991
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Process for producing paper from a poly(paraphenylene terephthalamide) fibrous gel
    Patent number: 5021123
    Abstract: A process for producing a fibrous gel composition of poly(paraphenylene terephthalamide) comprising the steps of placing terephthaloyl chloride in reactive contact with paraphenylene diamine in a solution of at least one amide-type polar solvent (e.g. N-methylpyrrolidone), an alkaline earth metal salt and the aliphatic tertiary amine, N-methylpyrrolidine or its hydrochloride. Poly(paraphenylene terephthalamide) papers are prepared by diluting the composition in an amide diluent, blending in a slurry of poly(paraphenylene terephthalamide) fibers in a precipitating medium, filtering, washing, pressing and drying the mixture.
    Type: Grant
    Filed: May 17, 1990
    Date of Patent: June 4, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Melt-processible aromatic containing copolyamide from 3,4'-bis (amino phenyl)ether
    Patent number: 4980446
    Abstract: Melt-processible aramids are prepared by catalytic polyamidation of 3,4'-bisaminophenyl ether with diphenylisophthalate or diphenyl 5-t-butylisophthalate and minor amounts of aliphatic components.
    Type: Grant
    Filed: March 16, 1989
    Date of Patent: December 25, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Process for the preparation of a poly(paraphenylene terephthalamide)fibrous gel composition and a process to produce poly(paraphenylene terephthalamide) paper from the composition
    Patent number: 4959453
    Abstract: A process for producing a fibrous gel composition of poly(paraphenylene terephthalamide) comprising the steps of placing terephthaloyl chloride in reactive contact with paraphenylene diamine in a solution of at least one amide-type polar solvent (e.g. N-methylpyrrolidone), an alkaline earth metal salt and the aliphatic tertiary amine, N-methylpyrrolidine or its hydrochloride. Poly(paraphenylene terephthalamide) papers are prepared by diluting the composition in an amide diluent, blending in a slurry of poly(paraphenylene terephthalamide) fibers in a precipitating mediu, filtering, washing, pressing and drying the mixture.
    Type: Grant
    Filed: April 3, 1989
    Date of Patent: September 25, 1990
    Assignee: E. I. du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Solvent system for difficultly soluble polymers
    Patent number: 4785038
    Abstract: Difficultly soluble aromatic polyamides, polybenzimidazoles and polyureas dissolve in a defined mixture of liquid sulfoxide, a base and an alcohol or water.
    Type: Grant
    Filed: July 27, 1987
    Date of Patent: November 15, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilfred Sweeny
  • Ester interchange polyester preparation with alkali metal fluoride catalyst
    Patent number: 4782131
    Abstract: Polyester formation is catalyzed by an alkali metal fluoride other than lithium fluoride.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: November 1, 1988
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Wilfred Sweeny
  • Method for making PBO and PBT polymers
    Patent number: 4608427
    Abstract: An improved process for preparing polybenzobisthiazoles and polybenzobisoxazoles involves reacting diethyl, di-n-propyl, diisopropyl or diisobutyl terephthalate rather than terephthalic acid with the appropriate dihydrochloride.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: August 26, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Wilfred Sweeny, Stephanie L. Kwolek
  • Cyclization of acrylic fiber
    Patent number: 4603041
    Abstract: Improved process for producing a carbon fiber having high tensile strength and high modulus involves oxidation of acrylonitrile fiber which has been treated with selected ammonium salts, from the group of ammonium sulfamate, ammonium bromide and ammonium iodide.
    Type: Grant
    Filed: July 19, 1984
    Date of Patent: July 29, 1986
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Wilfred Sweeny