Patents by Inventor Johnson C. H. Chen

Johnson C. H. Chen 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).

  • Removal of alkyl alkanesulfonate esters from alkanesulfonic acids and other organic media
    Patent number: 7297813
    Abstract: Methods of removing alkyl alkanesulfonate esters from aqueous or anhydrous compositions are provided. The invention provides methods for the conversion of alkyl alkanesulfonate esters of the formula RSO3R? to the corresponding acids of the formula RSO3H. The alkyl alkanesulfonate esters are present in an organic medium, which may contain significant amounts of water or which may be anhydrous or substantially anhydrous. In some embodiments, the invention provides methods for purifying aqueous or anhydrous alkanesulfonic acids by removing alkyl alkanesulfonate esters.
    Type: Grant
    Filed: August 5, 2004
    Date of Patent: November 20, 2007
    Assignee: Arkema Inc.
    Inventors: Gary Smith, Robert Cordova, Johnson C. H. Chen, Mabel Chen
  • Encapsulated phase change thermal energy storage materials and process
    Patent number: 4513053
    Abstract: A thermal energy storage composite pellet-shaped product of about 1/8 inch to 1 inch in size, formed of an outer seamless shell member which defines a cavity that permanently encases a phase-change composition, the composition being present in a quantity such that the total volume of the composition, whether in its solid form, liquid form, or both forms as in its transition state, never exceeds the volume of the cavity; and a process for making the product which includes using the phase-change composition in a compacted powder form as cast about which the shell member is formed by roll-coating steps.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: April 23, 1985
    Assignee: Pennwalt Corporation
    Inventors: Johnson C. H. Chen, John L. Eichelberger
  • Method for preparing encapsulated phase change materials
    Patent number: 4505953
    Abstract: A thermal energy storage composite pellet-shaped product of about 1/8 inch to 1 inch in size, formed of an outer seamless shell member which defines a cavity that permanently encases a phase-change composition, the composition being present in a quantity such that the total volume of the composition, whether in its solid form, liquid form, or both forms as in its transition state, never exceeds the volume of the cavity; and a process for making the product which includes using the phase-change composition in a compacted powder form as cast about which the shell member is formed by roll-coating steps.
    Type: Grant
    Filed: June 13, 1983
    Date of Patent: March 19, 1985
    Assignee: Pennwalt Corporation
    Inventors: Johnson C. H. Chen, John L. Eichelberger
  • Encapsulated phase change thermal energy _storage materials
    Patent number: 4504402
    Abstract: A thermal energy storage composite pellet-shaped product of about 1/8 inch to 1 inch in size, formed of an outer seamless shell member which defines a cavity that permanently encases a phase-change composition, the composition being present in a quantity such that the total volume of the composition, whether in its solid form, liquid form, or both forms as in its transition state, never exceeds the volume of the cavity; and a process for making the product which includes using the phase-change composition in a compacted powder form as cast about which the shell member is formed by roll-coating steps.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: March 12, 1985
    Assignee: Pennwalt Corporation
    Inventors: Johnson C. H. Chen, John L. Eichelberger