Patents by Inventor Hang Thanh Pham

Hang Thanh Pham 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).

  • Azeotrope-like composition of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride
    Patent number: 6060629
    Abstract: Provided are azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and hydrogen fluoride. Such are useful as an intermediate in the production of HFC-245fa. The latter is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent, aerosol propellant, heat transfer medium, dielectric, fire extinguishing composition and power cycle working fluid.
    Type: Grant
    Filed: September 10, 1999
    Date of Patent: May 9, 2000
    Assignee: AlliedSignal Inc.
    Inventors: Hang Thanh Pham, Rajiv Ratna Singh, Ian Robert Shankland, Hsueh Sung Tung
  • Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride
    Patent number: 6001796
    Abstract: Provided are azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and hydrogen fluoride. Such are useful as an intermediate in the production of HFC-245fa. The latter is useful as a nontoxic, zero ozone depleting fluorocarbon useful as a solvent, blowing agent, refrigerant, cleaning agent, aerosol propellant, heat transfer medium, dielectric, fire extinguishing composition and power cycle working fluid.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: December 14, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Hang Thanh Pham, Rajiv Ratna Singh, Ian Robert Shankland, Hsueh Sung Tung
  • Process for separating fluorocarbon compounds
    Patent number: 5948381
    Abstract: The invention provides a process for separating fluorinated organic compounds from mixtures of the such compounds and hydrogen fluoride. More particularly, the invention provides a method for separating a fluorinated organic compound from a mixture containing at least one fluorinated organic compound and hydrogen fluoride by adding an inorganic salt to the mixture.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: September 7, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Richard Elmer Eibeck, Hang Thanh Pham, Valentine Theodore Zuba
  • Process for separating hydrogen fluoride from fluorocarbons
    Patent number: 5918481
    Abstract: The invention provides a method for separating fluorocarbons from mixtures of fluorocarbon and hydrogen fluoride. In particular, the invention provides a method for separating fluorocarbons, such as pentafluoropropane, from azeotropic mixtures of the fluorocarbon and hydrogen fluoride using compositional variations with pressure.
    Type: Grant
    Filed: November 20, 1997
    Date of Patent: July 6, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Hang Thanh Pham, Rajiv Ratna Singh, Hsueh Sung Tung, Daniel Christopher Merkel, David Goldschmidt, Tadeusz Piotr Rygas
  • Separation of hydrogen fluoride from a fluorocarbon/hydrogen fluoride azeotropic mixture by sulfuric acid
    Patent number: 5895639
    Abstract: The invention provides a process for the separation of azeotropic mixtures of fluorocarbons from hydrogen fluoride. The most preferred fluorocarbon for this invention is 1,1,1,3,3-pentafluoropropane, which is also known as HFC-245fa. The separation in conducted by adding sulfuric acid to the mixture while the mixture is in either the liquid or gaseous states.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: April 20, 1999
    Assignee: AlliedSignal Inc.
    Inventors: Charles Francis Swain, Rajiv Ratna Singh, Hang Thanh Pham
  • Process for hydrogen fluoride separation
    Patent number: 5766483
    Abstract: A method for separating hydrogen fluoride from a chemical mixture is provided. In the process of the invention, hydrogen fluoride is separated from a chemical mixture containing hydrogen fluoride by contacting the chemical mixture with a hydrogen fluoride binder. The separated hydrogen fluoride may be recovered from the hydrogen fluoride binder.
    Type: Grant
    Filed: May 10, 1996
    Date of Patent: June 16, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Mathew Hermes Luly, Jeffrey Warren Mckown, Robert Pratt, Rajiv Ratna Singh, Paul Frederick Kunkel, Charles Lewis Redmon, Hang Thanh Pham
  • Process for the manufacture of 1,1,1,3,3-pentafluoropropane and 1,1,1,3,3,3-hexafluoropropane
    Patent number: 5763706
    Abstract: An integrated manufacturing process for producing HFC-245fa, HFC-236fa or a mixture thereof by reaction of HCC-240fa, HCC-230 or a mixture thereof with HF. HCC-240fa, HCC-230 or a mixture thereof is reacted with hydrogen fluoride in a liquid phase in the presence of a fluorination catalyst. Optionally, produced HCl is removed by distillation. HF present is thereafter recovered by liquid-vapor extraction. Unsaturated compounds are then removed by photochlorination and HFC-245fa, HFC-236fa or a mixture thereof is obtained by distillation.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: June 9, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Hsueh Sung Tung, Daniel Chistopher Merkel, Zenart Joseph Dziadyk, Clayton Herbert Carson, Hang Thanh Pham
  • Azeotrope-like compositions of trifluoromethane, carbon dioxide, ethane and hexafluoroethane
    Patent number: 5728315
    Abstract: Azeotrope-like compositions of trifluoromethane, carbon dioxide, ethane, and hexafluoroethane are provided. The compositions of the invention are environmentally desirable for use as refrigerants, aerosol propellants, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: March 17, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Rajiv Ratna Singh, Ian Robert Shankland, Roy Phillip Robinson, Hang Thanh Pham, Raymond Hilton Percival Thomas, Peter Brian Logsdon
  • Fluorination process using hydrogen fluoride-containing fluorinating agents
    Patent number: 5705717
    Abstract: Fluorination processes using hydrogen fluoride-containing fluorinating agents that are safely and easily handled, transported, and stored and that also exhibit good reactivity are provided. More particularly, the invention provides processes for producing fluorinated products using fluorinating agents comprising hydrogen fluoride and a carrier that may be an acid salt or a water-soluble polymer.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: January 6, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Michael Van Der Puy, Jeffrey Warren Mckown, Hang Thanh Pham, Andrew Joseph Poss, Rajiv Ratna Singh
  • Azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and C.sub.1 -C.sub.3 alcohols for cleaning
    Patent number: 5683974
    Abstract: Novel azeotrope-like compositions of 1,1,1,3,3-pentafluoropropane and C.sub.1 -C.sub.3 alcohols or mixtures thereof are useful in solvent cleaning.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: November 4, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Earl August Eugene Lund, deceased, Hang Thanh Pham, Ian Robert Shankland, Ellen Louise Swan
  • Alkylation process using hydrogen fluoride-containing alkylation catalysts
    Patent number: 5663474
    Abstract: This invention relates to catalysts for alkylation reactions and their preparation. More particularly, the invention relates to an alkylation process using a hydrogen fluoride-containing alkylation catalyst, which catalyst may be safely and easily handled, transported, and stored.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: September 2, 1997
    Assignee: AlliedSignal Inc.
    Inventors: Hang Thanh Pham, Robert Pratt, Charles Lewis Redmon, John James Thompson, Michael Van Der Puy, Rajiv Ratna Singh, William James Hague, Harold John Kieta, Matthew Hermes Luly, Jeffrey Warren McKown