Patents by Inventor Leonard Franciscus Sophia Stemkens

Leonard Franciscus Sophia Stemkens 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).

  • Ampholytic polymeric system
    Patent number: 9714313
    Abstract: The present invention relates to an ampholytic polymeric system obtainable by a process comprising the copolymerization of (i) a monomer according to Formula (1), (ii) an ethylenically unsaturated cationic monomer and (iii) a (co)polymer comprising an ethylenically unsaturated anionic monomer which comprises a sulfonate group: (1) wherein X is O or NR2, R1 and R2 are independently selected from the group consisting of hydrogen and C1-C6 alkyl groups or wherein R1 and R2 form together a (CR1R2)n- chain, wherein n is 3 to 12, and wherein R3 is independently selected from the group consisting of hydrogen and CH3. The present invention further relates to the use of ampholytic polymeric system in separation processes.
    Type: Grant
    Filed: May 4, 2012
    Date of Patent: July 25, 2017
    Assignee: Afira IPR B.V.
    Inventors: Johannes Petrus Aldegonda Custers, Leonard Franciscus Sophia Stemkens, Dirk Theodorus Andreas van Asseldonk
  • AMPHOLYTIC POLYMERIC SYSTEM
    Publication number: 20140190893
    Abstract: The present invention relates to an ampholytic polymeric system obtainable by a process comprising the copolymerisation of (i) a monomer according to Formula (1), (ii) an ethylenically unsaturated cationic monomer and (iii) a (co)polymer comprising an ethylenically unsaturated anionic monomer which comprises a sulfonate group: (1) wherein X is O or NR2, R1 and R2 are independently selected from the group consisting of hydrogen and C1-C6 alkyl groups or wherein R1 and R2 form together a (CR1R2)n- chain, wherein n is 3 to 12, and wherein R3 is independently selected from the group consisting of hydrogen and CH3. The present invention further relates to the use of ampholytic polymeric system in separation processes.
    Type: Application
    Filed: May 4, 2012
    Publication date: July 10, 2014
    Inventors: Johannes Petrus Aldegonda Custers, Leonard Franciscus Sophia Stemkens, Dirk Theodorus Andreas Van Asseldonk