Patents by Inventor William A. Evanko

William A. Evanko 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).

  • Method to produce cyclic esters
    Patent number: 5750732
    Abstract: Disclosed is a novel integrated process for production of cyclic esters which includes recovery of starting materials, such as lactic acid from a dilute aqueous lactic acid-containing solution, by solvent extraction. The starting materials are then formed into cyclic esters by removal of water wherein the concentration of higher molecular weight oligomers is maintained below about 20 wt % of the reaction composition. The process further includes providing a recovery solvent for the reaction composition and separating the cyclic esters from the starting materials and higher molecular weight oligomers by liquid-liquid equilibrium separation. The present invention is further directed toward independent novel unit operations of the overall process. The present invention provides for the efficient production and recovery of cyclic esters due to integration of the various unit operations by use of appropriate solvents and recycle streams.
    Type: Grant
    Filed: May 19, 1995
    Date of Patent: May 12, 1998
    Assignee: Chronopol, Inc.
    Inventors: Dan W. Verser, Alex Cheung, Timothy J. Eggeman, William A. Evanko, Kevin H. Schilling, Manfred Meiser, Anthony E. Allen, Melville E. D. Hillman, George E. Cremeans, Edward S. Lipinsky
  • Method to produce cyclic esters
    Patent number: 5420304
    Abstract: Disclosed is a novel integrated process for production of cyclic esters which includes recovery of starting materials, such as lactic acid from a dilute aqueous lactic acid-containing solution, by solvent extraction. The starting materials are then formed into cyclic esters by removal of water wherein the concentration of higher molecular weight oligomers is maintained below about 20 wt % of the reaction composition. The process further includes providing a recovery solvent for the reaction composition and separating the cyclic esters from the starting materials and higher molecular weight oligomers by liquid-liquid equilibrium separation. The present invention is further directed toward independent novel unit operations of the overall process. The present invention provides for the efficient production and recovery of cyclic esters due to integration of the various unit operations by use of appropriate solvents and recycle streams.
    Type: Grant
    Filed: September 29, 1993
    Date of Patent: May 30, 1995
    Assignee: BioPak Technology, Ltd.
    Inventors: Dan W. Verser, Alex Cheung, Timothy J. Eggeman, William A. Evanko, Kevin H. Schilling, Manfred Meiser, Anthony E. Allen, Melville E. D. Hillman, George E. Cremeans, Edward S. Lipinsky
  • Purification of hydrochloric acid
    Patent number: 5330735
    Abstract: A process is described by which numerous waste or by-product aqueous hydrochloric acid streams can be purified by contacting the aqueous hydrochloric acid with a polystyrenic based resin to remove silicon containing impurities and thereby allowing the hydrochloric acid to be re-used for various applications.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: July 19, 1994
    Assignee: Dow Corning Corporation
    Inventors: Kirk A. Cronin, William A. Evanko, Alireza Malekadeli