Patents by Inventor Charles Francis Swain

Charles Francis Swain 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).

  • Separation of halogenated compounds
    Patent number: 6821436
    Abstract: A process for removing a chlorinated methane impurity from a stream comprising a halogenated compound other than the chlorinated methane impurity, the process comprising contacting the stream with a polymer adsorbent to produce a purified product stream, the polymer adsorbent having a pore size distribution characterized by a higher cumulative porosity as a function of the log of pore diameter than that of activated carbon.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: November 23, 2004
    Assignee: Honeywell International Inc.
    Inventors: Kane David Cook, Charles Francis Swain, Peter Brian Logsdon
  • Separation of halogenated compounds
    Publication number: 20030155305
    Abstract: A process for removing a chlorinated methane impurity from a stream comprising a halogenated compound other than the chlorinated methane impurity, the process comprising contacting the stream with a polymer adsorbent to produce a purified product stream, the polymer adsorbent having a pore size distribution characterized by a higher cumulative porosity as a function of the log of pore diameter than that of activated carbon.
    Type: Application
    Filed: March 3, 2003
    Publication date: August 21, 2003
    Inventors: Kane David Cook, Charles Francis Swain, Peter Brian Logsdon
  • Purification of hydrofluorocarbons
    Patent number: 6488817
    Abstract: A process for the purification of difluoromethane comprising: (a) subjecting a mixture comprising at least difluoromethane (HFC-32) and dichlorodifluoromethane (CFC-12) to a first distillation step in which a majority of either CFC-12 or HFC-32 is concentrated in a first distillate and a majority of the other component is concentrated in a first bottoms; and (b) subjecting the first distillate in step (a) to at least one additional second distillation step conducted at a different pressure in which a majority of the component concentrated in said first distillate is concentrated in a second bottoms and in which the other component is concentrated in a second distillate; and (c) recovering purified HFC-32 from one of said first or second bottoms.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: December 3, 2002
    Assignee: AlliedSignal Inc.
    Inventors: Charles Francis Swain, Rajiv Ratna Singh, Hang Thanh Pham
  • 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 separating difluoromethane
    Patent number: 5785822
    Abstract: The present invention provides a method for separating dichlorodifluoromethane from difluoromethane. More specifically, a process is provided for separating dichlorodifluoromethane and difluoromethane using azeotropic distillation.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: July 28, 1998
    Assignee: AlliedSignal Inc.
    Inventors: Gustavo Cerri, Kin Ching Kong, Charles Francis Swain, Rajat Subhra Basu