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).

  • Foamed ionic compounds
    Patent number: 8946442
    Abstract: Foams of ionic compounds are described. Methods of making the foams are also provided. The foams are ionic and can be used for catalysis, separations, gas storage, biosensors, electronics, and electrochemical applications.
    Type: Grant
    Filed: December 21, 2010
    Date of Patent: February 3, 2015
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • COMPOSITIONS COMPRISING 2,3,3,3-TETRAFLUOROPROPENE AND HYDROCARBONS AND USES THEREOF
    Publication number: 20150007592
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises 2,3,3,3-tetrafluoropropene (HFC-1234yf) and at least one hydrocarbon. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, and aerosol propellants.
    Type: Application
    Filed: September 23, 2014
    Publication date: January 8, 2015
    Inventors: BARBARA HAVILAND MINOR, THOMAS JOSEPH LECK, DONALD BERNARD BIVENS, AKIMICHI YOKOZEKI
  • Compositions comprising 2,3,3,3-tetrafluoropropene and hydrocarbons and uses thereof
    Patent number: 8871112
    Abstract: The present invention relates to compositions for use in refrigeration, air-conditioning, and heat pump systems wherein the composition comprises 2,3,3,3-tetrafluoropropene (HFC-1234yf) and at least one hydrocarbon. The compositions of the present invention are useful in processes for producing cooling or heat, as heat transfer fluids, foam blowing agents, and aerosol propellants.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: October 28, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Barbara Haviland Minor, Thomas J. Leck, Donald Bernard Bivens, Akimichi Yokozeki
  • Mixtures of Ammonia and Ionic Liquids
    Publication number: 20140286849
    Abstract: Mixtures of ammonia and ionic liquids are provided that are suitable for use as absorption cooling fluids in absorption cycles, and ammonia storage.
    Type: Application
    Filed: June 3, 2014
    Publication date: September 25, 2014
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MARK BRANDON SHIFLETT, AKIMICHI YOKOZEKI
  • Process and reactor system for producing ammonia using ionic liquids
    Patent number: 8808659
    Abstract: A process and a reactor system for producing ammonia is described. The ammonia produced, such as by the Haber process, is absorbed into an ionic liquid. The removal of ammonia shifts the reaction equilibrium toward the production of ammonia, resulting in higher yields of ammonia.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: August 19, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Process for purifying perfluorinated products
    Patent number: 8771626
    Abstract: This invention relates to a process for purifying at least one of perfluoromethane and nitrogen trifluoride from a mixture thereof using an ionic liquid. The process may be performed by a technique such as extractive distillation or absorption wherein at least one ionic liquid is used as the entraining agent or absorbent, respectively.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: July 8, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Absorption cycle utilizing ionic liquid as working fluid
    Patent number: 8715521
    Abstract: The present invention relates to an absorption cycle comprising a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides an absorption cycle that utilizes fluorocarbon gases in fluorinated ionic liquids. The present invention also provides a method of cooling using an absorption cycle comprising a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides a method of heating using an absorption cycle comprising a refrigerant pair comprising at least one refrigerant and at least one ionic liquid.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: May 6, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Hybrid vapor compression-absorption cycle
    Patent number: 8707720
    Abstract: The present invention relates to a hybrid vapor compression—absorption cooling or heating system and apparatus containing a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides for the performance of a hybrid vapor compression—absorption cycle that utilizes refrigerants and absorbents such as fluorocarbon gases in fluorinated ionic liquids. The present invention also provides a method of cooling by the execution of a hybrid vapor compression—absorption cycle using a refrigerant pair comprising at least one refrigerant and at least one ionic liquid. The present invention also provides a method of heating by the execution of a hybrid vapor compression—absorption cycle using a refrigerant pair comprising at least one refrigerant and at least one ionic liquid.
    Type: Grant
    Filed: June 22, 2010
    Date of Patent: April 29, 2014
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Utilizing ionic liquids for hydrofluorocarbon separation
    Patent number: 8628644
    Abstract: The present invention relates to a process for separating close-boiling and azeotropic components of mixtures, wherein said mixtures contain at least one hydrofluorocarbon compound, using at least one ionic liquid.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: January 14, 2014
    Assignee: E I du Pont Nemours and Company
    Inventors: Mark B. Shiflett, Akimichi Yokozeki
  • ABSORPTION CYCLE UTILIZING IONIC LIQUIDS AND WATER AS WORKING FLUIDS
    Publication number: 20130327084
    Abstract: This invention relates to a composition comprising water and at least one ionic liquid, and also to devices capable of executing an absorption cycle using such compositions as a refrigerant pair. This invention also provides a method of cooling using an absorption cycle comprising water as the refrigerant and at least one ionic liquid as the absorbent. The present invention also provides a method of heating using an absorption cycle comprising water as the refrigerant and at least one ionic liquid.
    Type: Application
    Filed: August 12, 2013
    Publication date: December 12, 2013
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: MARK BRANDON SHIFLETT, Akimichi Yokozeki
  • Vapor compression cycle utilizing ionic liquid as compressor lubricant
    Patent number: 8568608
    Abstract: This invention relates to the use of ionic liquids as lubricants in vapor compression systems for cooling or heating. This invention also relates to an apparatus for adjusting temperature that operates a vapor compression cycle.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: October 29, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • PROCESS FOR SEPARATION OF TETRAFLUOROETHYLENE FROM CARBON DIOXIDE USING IONIC LIQUIDS
    Publication number: 20130231448
    Abstract: A process for separating tetrafluoroethylene from a mixture comprising tetrafluoroethylene and carbon dioxide by contacting the mixture with at least one ionic liquid.
    Type: Application
    Filed: November 19, 2012
    Publication date: September 5, 2013
    Applicant: E I DU PONT DE NEMOURS AND COMPANY
    Inventors: Mark Brandon SHIFLETT, Akimichi YOKOZEKI
  • Absorption cycle utilizing ionic liquids and water as working fluids
    Patent number: 8506839
    Abstract: This invention relates to a composition comprising water and at least one ionic liquid, and also to devices capable of executing an absorption cycle using such compositions as a refrigerant pair. This invention also provides a method of cooling using an absorption cycle comprising water as the refrigerant and at least one ionic liquid as the absorbent. The present invention also provides a method of heating using an absorption cycle comprising water as the refrigerant and at least one ionic liquid.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: August 13, 2013
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • REFRIGERANT STORAGE IN SECONDARY LOOP REFRIGERATION SYSTEMS
    Publication number: 20130061612
    Abstract: A process and system for storing and recovering a secondary refrigerant such as carbon dioxide in a secondary loop refrigeration system after a shutdown of the primary refrigeration system using ionic liquids is described. The process eliminates the release of the secondary refrigerant into the environment and the need to recharge the secondary loop after a shutdown of the primary refrigeration system.
    Type: Application
    Filed: November 10, 2010
    Publication date: March 14, 2013
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Process for separation of tetrafluoroethylene from carbon dioxide using ionic liquids
    Patent number: 8313558
    Abstract: A process for separating tetrafluoroethylene from a mixture comprising tetrafluoroethylene and carbon dioxide by contacting the mixture with at least one ionic liquid.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: November 20, 2012
    Assignee: E I du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • PROCESS FOR THE SEPARATION OF FLUOROCARBONS USING IONIC LIQUIDS
    Publication number: 20120165579
    Abstract: This invention relates to a process for separating 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane wherein at least one ionic liquid is used to enhance the efficiency of the separation.
    Type: Application
    Filed: June 20, 2011
    Publication date: June 28, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MARK BRANDON SHIFLETT, AKIMICHI YOKOZEKI, JEFFREY P. KNAPP
  • PROCESS AND REACTOR SYSTEM FOR PRODUCING AMMONIA USING IONIC LIQUIDS
    Publication number: 20120027661
    Abstract: A process and a reactor system for producing ammonia is described. The ammonia produced, such as by the Haber process, is absorbed into an ionic liquid. The removal of ammonia shifts the reaction equilibrium toward the production of ammonia, resulting in higher yields of ammonia.
    Type: Application
    Filed: January 27, 2011
    Publication date: February 2, 2012
    Applicant: E. I. DU PONT DE NEMOURS AND COMPANY
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • FOAMED IONIC COMPOUNDS
    Publication number: 20110319633
    Abstract: Foams of ionic compounds are described. Methods of making the foams are also provided. The foams are ionic and can be used for catalysis, separations, gas storage, biosensors, electronics, and electrochemical applications.
    Type: Application
    Filed: December 21, 2010
    Publication date: December 29, 2011
    Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
    Inventors: MARK BRANDON SHIFLETT, AKIMICHI YOKOZEKI
  • Process for the separation of diastereomers
    Patent number: 8075777
    Abstract: A process for separating the diastereomers of a compound such as dihydrodecafluoropentane by using an ionic liquid to increase separation efficiency. The process may involve separation of the threo and erythro diastereomers of HFC-4310mee by liquid-liquid extraction wherein at least one ionic liquid is used as the extractant.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: December 13, 2011
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki
  • Process for the separation of fluorocarbons using ionic liquids
    Patent number: 7964760
    Abstract: This invention relates to a process for separating 1,1,2,2-tetrafluoroethane or 1,1,1,2-tetrafluoroethane from a mixture comprising both 1,1,1,2-tetrafluoroethane and 1,1,2,2-tetrafluoroethane wherein at least one ionic liquid is used to enhance the efficiency of the separation.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: June 21, 2011
    Assignee: E.I. du Pont de Nemours and Company
    Inventors: Mark Brandon Shiflett, Akimichi Yokozeki, Jeffrey P. Knapp