Patents by Inventor Ewa Dominica PTAK

Ewa Dominica PTAK 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).

  • Liquid-crystal material
    Patent number: 11015123
    Abstract: The present application relates to a liquid-crystalline material comprising a sterically hindered N-oxide and a dye. The invention furthermore relates to the use of the liquid-crystalline material in an optical switching device for regulation of the passage of sunlight.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: May 25, 2021
    Assignee: MERCK PATENT GMBH
    Inventors: Michael Junge, Ursula Patwal, Ewa Dominica Ptak
  • LIQUID-CRYSTAL MATERIAL
    Publication number: 20200255741
    Abstract: The present application relates to a liquid-crystalline material comprising a sterically hindered N-oxide and a dye. The invention furthermore relates to the use of the liquid-crystalline material in an optical switching device for regulation of the passage of sunlight.
    Type: Application
    Filed: May 16, 2017
    Publication date: August 13, 2020
    Applicant: MERCK PATENT GMBH
    Inventors: Michael JUNGE, Ursula PATWAL, Ewa Dominica PTAK