Patents by Inventor Richard T. Chou

Richard T. Chou 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: 6528550
    Abstract: This invention relates to crosslinked polymer foam compositions of an ethylene vinyl acetate copolymer, an ethylene/acrylic acid copolymer or ionomer, and a crosslinking agent. Such compositions exhibit enhanced melt strength, as well as lower density and compression set. They are especially useful as midsoles or insoles for footwear.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: March 4, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Chin-Fu Hsu, Richard T. Chou, Wayne C. Whelchel, Yun Tong Ou
  • Patent number: 6518365
    Abstract: The present invention relates to high melt swell partially neutralized alpha olefin acid copolymers. It also relates to a process for making such high melt swell polymers as well as for covalently crosslinking other polar copolymers including non-neutralized acid copolymers and non-polar alpha olefin polymers by using a minor amount of metal acrylate, particularly sodium or zinc acrylate.
    Type: Grant
    Filed: July 28, 2000
    Date of Patent: February 11, 2003
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Richard James Powell, Richard T. Chou, George W. Prejean
  • Patent number: 5580927
    Abstract: New Ionomer compositions which have improved moldability and improved high temperature behavior are based on ionomer polymerized at normal pressures but lower than normal temperatures. The compositions may be blends with standard ionomer, particularly if the low-temperature-prepared ionomer is prepared at very low temperatures which reduces productivity compared with standard ionomer, or useful alone when prepared at intermediate temperatures.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: December 3, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard T. Chou, Robert J. Statz
  • Patent number: 5208082
    Abstract: A blend of 5 to 95 percent of an ethylene vinyl alcohol copolymer and 95 to 5 percent of an amorphous polyamide having fewer than about 0.100 equivalents of carboxyl end groups per kilogram of polyamide exhibits improved oxidative and thermal stability. The blend is useful for preparing films and multiple layered structures including thermoformed structures and oriented shrink films.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: May 4, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard T. Chou
  • Patent number: 5126402
    Abstract: A blend of 5 to 95 percent of an ethylene vinyl alcohol copolymer and 95 to 5 percent of an amorphous polyamide having fewer than about 0.100 equivalents of carboxyl end groups per kilogram of polyamide exhibits improved oxidative and thermal stability. The blend is useful for preparing films and multiple layered structures including thermoformed structures and oriented shrink films.
    Type: Grant
    Filed: July 12, 1990
    Date of Patent: June 30, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard T. Chou
  • Patent number: 5126401
    Abstract: A blenad consisting ethylene vinyl alcohol copolymer and a polyamide blend of an amorphous polyamide and a semicrystalline polyamide which is miscible with the amorphous polyamide but substantially immiscible with the vinyl alcohol copolymer exhibits good mechanical and barrier properties as well as good resistance to thermal degradation.
    Type: Grant
    Filed: July 19, 1990
    Date of Patent: June 30, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard T. Chou
  • Patent number: 5064716
    Abstract: Blends of a major portion of ethylene vinyl alcohol copolymer (EVOH) and a minor portion of an amorphous polyamide and preferably also a semicrystalline nylon are disclosed. These blends may be formed into films or multilayer structures, which can be thermoformed into containers or other articles. The presence of the minor portion of amorphous polyamide permits thermoforming of the EVOH at lower temperatures without the formation of defects.
    Type: Grant
    Filed: September 7, 1990
    Date of Patent: November 12, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard T. Chou, Gedeon I. Deak
  • Patent number: 4990562
    Abstract: Blends of a major portion of ethylene vinyl alcohol copolymer (EVOH) and a minor portion of an amorphous polyamide and preferably also a semicrystalline nylon are disclosed. These blends may be formed into films or multilayer structures, which can be thermoformed into containers or other articles. The presence of the minor portion of amorphous polyamide permits thermoforming of the EVOH at lower temperatures without the formation of defects.
    Type: Grant
    Filed: January 26, 1989
    Date of Patent: February 5, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Richard T. Chou, Gedeon I. Deak
  • Patent number: 4778856
    Abstract: A polymer composition comprising (a) 35-65 parts by weight polyvinyl chloride, (b) 10-55 parts by weight chlorinated polyethylene or chlorosulfonated polyethylene elastomer or mixtures thereof containing 24-40 weight percent chlorine, (c) 10-55 parts by weight of a chlorinated polyethylene or chlorosulfonated polyethylene elastomer or mixtures thereof containing 40-52 weight percent chlorine with the proviso that the chlorine level of the elastomers (b) and (c) differ by at least 5 weight percent, and (d) 1-30 parts by weight per 100 parts by weight of total chlorinated polymers (a), (b) and (c) of an ethylene terpolymer containing 48-74 weight percent ethylene, 20-40 weight percent vinyl acetate or alkyl acrylate wherein the alkyl group contains 1-10 carbon atoms, and 6-14 weight percent carbon monoxide. Such compositions are useful as pond liners, roofing membranes, wire and cable covering, and window profiles.
    Type: Grant
    Filed: May 26, 1987
    Date of Patent: October 18, 1988
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: John C. Chen, Richard T. Chou
  • Patent number: 4709039
    Abstract: This invention relates to new organic compounds, including 2-(2-allyloxy-1-methylethyl)-2-oxazoline and 2-(vinylbenzyloxy-1-methylethyl)-2-oxazoline. Its method of preparation comprises condensing 2-(3-hydroxy-2-propyl)-2-oxazoline with allyl chloride and vinylbenzyl chloride, respectively, in a phase transfer process. The invention is also directed to a method of copolymerizing 2-ethyloxazoline with such compounds.
    Type: Grant
    Filed: March 21, 1986
    Date of Patent: November 24, 1987
    Assignee: The Dow Chemical Company
    Inventor: Richard T. Chou
  • Patent number: 4698392
    Abstract: A curable polymeric composition exhibiting good low temperature flexibility comprising about 50-90 parts by weight chlorinated polyethylene or chlorosulfonated polyethylene containing about 30-45 weight percent chlorine, and about 10-50 parts by weight of an ethylene terpolymer of 48-74 weight percent ethylene, 20-40 weight percent alkyl acrylate wherein the alkyl group contains 4-9 carbon atoms, and 6-12 weight percent carbon monoxide or sulfur dioxide. Such polymeric blends are especially useful for low temperature applications in contact with oil, e.g. automotive seals and hoses.
    Type: Grant
    Filed: May 2, 1986
    Date of Patent: October 6, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Richard T. Chou