Patents by Inventor Akimichi Yokozeki

Akimichi Yokozeki 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).

  • Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane
    Patent number: 5725791
    Abstract: The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams, are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: March 10, 1998
    Assignee: E. I. du pont de Nemours and Company
    Inventors: Donald Bernard Bivens, Brooks Shawn Lunger, Akimichi Yokozeki
  • Azeotropic or azeotrope-like compositions of ammonia and tetrafluoroethane
    Patent number: 5700388
    Abstract: Constant boiling azeotropic or azeotrope-like compositions of ammonia and 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, difluoromethane, pentafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane are disclosed that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
    Type: Grant
    Filed: October 28, 1994
    Date of Patent: December 23, 1997
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane and (iso) butane
    Patent number: 5648017
    Abstract: The azeotropic compositions of 1,1,2,2-tetrafluoroethane and 1,1-difluoroethane and the azeotropic and azeotropic-like composition of 1,1,2,2-tetrafluoroethane and one of, 1-chloro-1,1-difluoroethane, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams, are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: July 15, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip Lee Bartlett, Donald Bernard Bivens, Brooks Shawn Lunger, Akimichi Yokozeki
  • Near-azeotropic blends for use as refrigerants with pentafluoroethane, trifluoroethane, and tetrafluoroethane
    Patent number: 5635099
    Abstract: Near-Azeotropic blends of:pentafluoroethane and 1,1,1-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, and perfluorocyclopropane;chlorodifluoromethane and pentafluoroethane with one or more of ethane, butane, isobutane, dimethyl ether, propylene, and difluoromethane;chlorodifluoromethane with 1,1,1-trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,1-trifluoroethane and octafluoropropane;and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane, along with their use as refrigerants.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: June 3, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Mark B. Shiflett, Akimichi Yokozeki
  • Azeotrope-like refrigerants with chlorodifluoromethane, pentafluoroethane, and C.sub.2 -C.sub.4 hydrocarbon
    Patent number: 5616276
    Abstract: Near-Azeotropic blends of:pentafluoroethane and 1,1,1-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, and perfluorocyclopropane;chlorodifluoromethane and pentafluoroethane with one or more of ethane, butane, isobutane, dimethyl ether, propylene, and difluoromethane;chlorodifluoromethane with 1,1,1-trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,1-trifluoroethane and octafluoropropane;and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane, along with their use as refrigerants.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 1, 1997
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Mark B. Shiflett, Akimichi Yokozeki
  • Compositions of 1,1,1,2-tetrafluoroethane and dimethyl ether
    Patent number: 5516446
    Abstract: Substantially constant boiling compositions of 1,1,1,2-tetrafluoroethane and dimethyl ether and its use as a refrigerant, aerosol propellant and polymer foam blowing agent are disclosed.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: May 14, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Akimichi Yokozeki
  • Compositions of 2,2-dichloro-1,1,1-trifluoroethane and pentafluoropropane
    Patent number: 5447646
    Abstract: Compositions of 2,2-dichloro-1,1,1-trifluoroethane and 1,1,2,2,3-pentafluoropropane, 1,1,2,3,3-pentafluoropropane or 1,1,1,2,3-pentafluoropropane.
    Type: Grant
    Filed: November 12, 1993
    Date of Patent: September 5, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Tuneen E. C. Chisolm, Diana L. Klug, Mark B. Shiflett, Akimichi Yokozeki
  • Process for heating and cooling using substantially constant boiling compositions of fluorinated hydrocarbons
    Patent number: 5403504
    Abstract: Constant boiling mixtures of pentafluoroethane and difluoromethane are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes, and as power cycle working fluids.
    Type: Grant
    Filed: September 10, 1993
    Date of Patent: April 4, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Mark B. Shiflett, Akimichi Yokozeki
  • Azeotropic or azeotrope-like compositions of ammonia and hydrofluorocarbons
    Patent number: 5387357
    Abstract: Constant boiling azeotropic or azeotrope-like compositions of ammonia and 1,1,1,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, difluoromethane, pentafluoroethane or 1,1,1,2,3,3,3-heptafluoropropane are disclosed that are useful as refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes and as power cycle working fluids.
    Type: Grant
    Filed: September 25, 1992
    Date of Patent: February 7, 1995
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Mark B. Shiflett, Akimichi Yokozeki
  • Safe handling of tetrafluoroethylene
    Patent number: 5345013
    Abstract: Tetrafluoroethylene is made safe (non-explosive) to handle by forming a liquid solution of tetrafluoroethylene and carbon dioxide, one in the other, in a pressurized container.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: September 6, 1994
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: David J. Van Bramer, Mark B. Shiflett, Akimichi Yokozeki
  • Substantially constant boiling compositions of 1,1,1,2-tetra-fluoroethane and dimethyl ether
    Patent number: 5284596
    Abstract: Substantially constant boiling compositions of 1,1,1,2-tetrafluoroethane and dimethyl ether and its use as a refrigerant, aerosol propellant and polymer foam blowing agent are disclosed.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Akimichi Yokozeki
  • Near-azeotropic blends for use as refrigerants
    Patent number: 5277834
    Abstract: Near-Azeotropic blends of:pentafluoroethane and 1,1,1-trifluoroethane with one or more of chlorodifluoromethane, 1,2,2,2-tetrafluoroethane, 1,1,2,2-tetrafluoroethane, 1-chloro-1,1,2,2-tetrafluoroethane, 1-chloro-1,2,2,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoropropane, 1,1,1,2,2,3,3-heptafluoropropane, and perfluorocyclopropane;chlorodifluoromethane and pentafluoroethane with one or more of ethane, butane, isobutane, dimethyl ether, propylene, and difluoromethane;chlorodifluoromethane with 1,1,1-trifluoroethane and 1,2,2,2-tetrafluoroethane, propane and pentafluoroethane, or 1,1,1-trifluoroethane and octafluoropropane;and pentafluoroethane with fluoroethane and 1,2,2,2-tetrafluoroethane,along with their use as refrigerants.
    Type: Grant
    Filed: December 22, 1992
    Date of Patent: January 11, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Mark B. Shiflett, Akimichi Yokozeki
  • Azeotropic compositions of 1,1-dichloro-1-fluoroethane and methanol/ethanol
    Patent number: 5246617
    Abstract: Azeotropic mixtures of 1,1-dichloro-1-fluoroethane (HCFC-141b) with methanol or ethanol, the azeotropic mixtures being useful in solvent cleaning applications.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: September 21, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Abid N. Merchant, Akimichi Yokozeki
  • Azeotropic compositions of 1,1,2,2,3,3,4,4-octafluorobutane and alcohols or ketones
    Patent number: 5221493
    Abstract: Azeotropic mixtures of HFC-338pcc and an alcohol such as methanol, ethanol, isopropanol or N-propanol, or a ketone such as acetone, are disclosed that are useful as cleaning agents, refrigerants, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing agents, expansion agents for polyolefins and polyurethanes, power cycle working fluids, polymerization media, particulate removal fluids, carrier fluids, and displacement drying agents.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: June 22, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Abid N. Merchant, Allen C. Sievert, Akimichi Yokozeki, Janet C. Sung
  • Azeotropic and azeotrope-like compositions of 1,1,2,2-tetrafluoroethane
    Patent number: 5182040
    Abstract: The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of 1,1-difluoroethane, 1-chloro-1,1,-difluoroethane, dimethyl ether, perfluorocyclobutane, n-butane, isobutane and 1,1,1,2,3,3,3-heptafluoropropane, and their use as refrigerants, aerosol propellants and blowing agents for polymer foams are disclosed. The azeotropic and azeotrope-like compositions of 1,1,1,2-tetrafluoroethane and one of perfluorocyclobutane and 1,1,1,2,3,3,3-heptafluoropropane are also useful as fire extinguishants.
    Type: Grant
    Filed: March 28, 1991
    Date of Patent: January 26, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Philip L. Bartlett, Donald B. Bivens, Brooks S. Lunger, Akimichi Yokozeki
  • Azeotropic composition of 1-chloro-1,2,2,2-tetrafluoroethane and dimethyl ether
    Patent number: 5061394
    Abstract: The azeotrope of 1-chloro-1,2,2,2-tetrafluoroethane and dimethyl ether is useful as a refrigerant, aerosol propellant and polymer foam blowing agent.
    Type: Grant
    Filed: March 13, 1990
    Date of Patent: October 29, 1991
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Akimichi Yokozeki, Philip L. Bartlett, Joseph A. Creazzo
  • Azeotropic compositions of trichlorotrifluoroethane, dichlorodifluoroethane and methanol/ethanol
    Patent number: 4715900
    Abstract: Azeotropic mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane (FC-113) and 1,2-dichloro-1,1-difluoroethane (FC-132b) with methanol or ethanol, the azeotropic mixtures being useful in solvent cleaning applications.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: December 29, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Helen A. Connon, Robert A. Gorski, William G. Kenyon, Akimichi Yokozeki