Patents by Inventor Charles J. Holada

Charles J. Holada 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).

  • Continuous production of DMAEA quaternary salts
    Patent number: 8247597
    Abstract: The invention provides a method of continuously producing high quality quaternized N,N-dialkylaminoethyl (meth)acrylates (DMAEA.MCQ) that has a long shelf life and which is stable in water. The method involves placing starting materials into a continuously stirred tank reactor in the presence of less than 6% water. This low amount of water causes two liquid phases to form and prevents unwanted side reactions. The denser liquid phase contains DMAEA.MCQ and the lighter phase contains the starting materials. Liquid from the denser phase is removed from a position where little of the lighter phase has been mixed in. The removed liquid then has any last traces of the starting materials reacted into DMAEA.MCQ and strips away any starting materials with a gas flow. The resulting liquid is high purity DMAEA.MCQ. Water can then safely be added to ease in the transport and use of the produced DMAEA.MCQ.
    Type: Grant
    Filed: January 21, 2010
    Date of Patent: August 21, 2012
    Assignee: Nalco Company
    Inventors: Barbara E. Fair, Peter E. Reed, Leonard M. Ver Vers, Larry E. Brammer, Jr., Charles J. Holada, Cheng-Sung Huang, Kailas B. Sawant
  • CONTINUOUS PRODUCTION OF DMAEA QUATERNARY SALTS
    Publication number: 20110178327
    Abstract: The invention provides a method of continuously producing high quality quaternized N,N-dialkylaminoethyl (meth)acrylates (DMAEA.MCQ) that has a long shelf life and which is stable in water. The method involves placing starting materials into a continuously stirred tank reactor in the presence of less than 6% water. This low amount of water causes two liquid phases to form and prevents unwanted side reactions. The denser liquid phase contains DMAEA.MCQ and the lighter phase contains the starting materials. Liquid from the denser phase is removed from a position where little of the lighter phase has been mixed in. The removed liquid then has any last traces of the starting materials reacted into DMAEA.MCQ and strips away any starting materials with a gas flow. The resulting liquid is high purity DMAEA.MCQ. Water can then safely be added to ease in the transport and use of the produced DMAEA.MCQ.
    Type: Application
    Filed: January 21, 2010
    Publication date: July 21, 2011
    Inventors: Barbara E. Fair, Peter E. Reed, Leonard M. Ver Vers, Larry E. Brammer, JR., Charles J. Holada, Cheng-Sung Huang, Kailas B. Sawant