Patents by Inventor Mechthild Kopf

Mechthild Kopf 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).

  • Process for broadening cholesteric reflection bands of photopolymerizable cholesteric liquid crystals, and optical elements produced by this process
    Patent number: 6057008
    Abstract: Process for broadening cholesteric reflection bands of photopolymerizable cholesteric liquid crystals, and optical elements produced by this process. The invention relates to a process for broadening the cholesteric reflection bands of photopolymerizable cholesteric liquid crystals, which comprises the following process steps:1) partial polymerization of a layer containing photopolymerizable cholesteric liquid crystals by exposure to actinic light for a defined brief period at a defined temperature,2) observance of a defined waiting time without exposure (dark phase) at a defined temperature,3) fixing of the resultant layer by exposure to actinic light at a defined temperature.
    Type: Grant
    Filed: June 11, 1998
    Date of Patent: May 2, 2000
    Assignee: Consortium fur elekrochemische Industrie GmbH
    Inventors: Georg Schwalb, Mechthild Kopf, Franz-Heinrich Kreuzer