Patents by Inventor Stephan Wittmar

Stephan Wittmar 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).

  • High molecular weight poly(methacrylic acid)
    Patent number: 11447583
    Abstract: The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) (“PMAA”) in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.
    Type: Grant
    Filed: April 13, 2021
    Date of Patent: September 20, 2022
    Assignee: Alcon Inc.
    Inventors: Stephan Wittmar, Thomas Schmidt, Justyna Justynska-Reimann, Claudio Hofmann
  • HIGH MOLECULAR WEIGHT POLY(METHACRYLIC ACID)
    Publication number: 20210230321
    Abstract: The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) (“PMAA”) in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.
    Type: Application
    Filed: April 13, 2021
    Publication date: July 29, 2021
    Inventors: Stephan Wittmar, Thomas Schmidt, Justyna Justynska-Reimann, Claudio Hofmann
  • High molecular weight poly(methacrylic acid)
    Patent number: 11001652
    Abstract: The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) (“PMAA”) in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: May 11, 2021
    Assignee: Alcon Inc.
    Inventors: Stephan Wittmar, Thomas Schmidt, Justyna Justynska-Reimann, Claudio Hofmann
  • Soft contact lenses with a lubricious coating covalently-attached thereon
    Patent number: 10782450
    Abstract: The invention is generally related to soft contact lenses which comprise a polyvinylalcohol-based hydrogel lens body and a durable lubricious coating thereon which are covalently attached to the polyvinylalcohol-based hydrogel lens body through 6-membered acetal rings and to a method for producing the same.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: September 22, 2020
    Assignee: Alcon Inc.
    Inventors: Harald Bothe, Bernhard Seiferling, Heike Arndt, Thomas Wasse, Stephan Wittmar
  • HIGH MOLECULAR WEIGHT POLY(METHACRYLIC ACID)
    Publication number: 20200239606
    Abstract: The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) (“PMAA”) in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.
    Type: Application
    Filed: January 27, 2020
    Publication date: July 30, 2020
    Inventors: Stephan Wittmar, Thomas Schmidt, Justyna Justynska-Reimann, Claudio Hofmann
  • SOFT CONTACT LENSES WITH A LUBRICIOUS COATING COVALENTLY-ATTACHED THEREON
    Publication number: 20180113236
    Abstract: The invention is generally related to soft contact lenses which comprise a polyvinylalcohol-based hydrogel lens body and a durable lubricious coating thereon which are covalently attached to the polyvinylalcohol-based hydrogel lens body through 6-membered acetal rings and to a method for producing the same.
    Type: Application
    Filed: October 25, 2017
    Publication date: April 26, 2018
    Inventors: Harald Bothe, Bernhard Seiferling, Heike Arndt, Thomas Wasse, Stephan Wittmar