Patents by Inventor Weilian Lang

Weilian Lang 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).

  • Synthetic multiple quaternary ammonium salts
    Patent number: 7214806
    Abstract: This invention pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula: wherein each R1, R?1, R2, R?2, R3, R?3, R4 or R5 is independently selected from the group consisting alkyl, aryl, aralkyl and —CH2—CH(OR6)—CH2N+R1R2R3; wherein one or more R6 group is selected from the group consisting of: and wherein An? is an anion. This invention also pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula: wherein each R1, R?1, R2, R?2, R3 or R?3 group is independently selected from the group consisting of alkyl, aryl, aralkyl and —CH2—CH(OR4)—CH2N+R1R2R3; wherein one or more R4 group is selected from the group consisting of: and wherein An? is an anion.
    Type: Grant
    Filed: March 8, 2004
    Date of Patent: May 8, 2007
    Assignee: Sachem, Inc.
    Inventors: Weilian Lang, Charles Little, Victor van de Pas
  • Synthetic multiple quaternary ammonium salts
    Publication number: 20050194113
    Abstract: This invention pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula: wherein each R1, R?1, R2, R?2, R3, R?3, R4 or R5 is independently selected from the group consisting alkyl, aryl, aralkyl and —CH2—CH(OR6)—CH2N+R1R2R3; wherein one or more R6 group is selected from the group consisting of: and wherein An? is an anion. This invention also pertains to novel multiple quaternary ammonium salts and their derivatives represented by the formula: wherein each R1, R?1, R2, R?2, R3 or R?3 group is independently selected from the group consisting of alkyl, aryl, aralkyl and —CH2—CH(OR4)—CH2N+R1R2R3; wherein one or more R4 group is selected from the group consisting of: and wherein An? is an anion.
    Type: Application
    Filed: March 8, 2004
    Publication date: September 8, 2005
    Inventors: Weilian Lang, Charles Little, Victor van de Pas
  • Process for recovering organic hydroxides from waste solutions
    Patent number: 6217743
    Abstract: In one embodiment, the present invention relates to a process for recovering an onium compound from waste solutions or synthetic solutions containing the onium compound and impurities including the steps: contacting the waste solution or synthetic solution with a metal ion scavenger to remove metal ion impurities, wherein the metal ion scavenger comprises at least one of a chelating compound, a nanoporous material, and a magnetically assisted (MACS) material; charging the waste solution or synthetic solution to an electrochemical cell containing at least two compartments, a cathode, an anode and a divider and passing a current through the cell whereby the onium compound is regenerated or produced; and recovering the onium compound from the cell.
    Type: Grant
    Filed: August 9, 1999
    Date of Patent: April 17, 2001
    Assignee: Sachem, Inc.
    Inventors: Roger D. Moulton, Weilian Lang, Allen Tanner