Patents by Inventor Heinz-Joachim Rieger

Heinz-Joachim Rieger 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).

  • Patent number: 5859680
    Abstract: A process for the stabilization of the spatial alignment of the smectic layers in an FLC switching and/or display element, in which the original position of the smectic layers has been modified by electrical field treatment, which comprises alternately switching the elements during non-operation and/or when a certain temperature is exceeded which is above a predetermined temperature range which includes the operating temperature region and/or when the temperature falls below a certain temperature which is below a predetermined temperature range which includes the operating temperature region. Use of the process according to the invention ensures long-term functioning of the switching and display device, even in the case of repeated regeneration of the quasi-bookshelf geometry, and prevents worsening in the contrast and brightness and the occurrence of ghost images.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: January 12, 1999
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Dietmar Jungbauer, Heinz-Joachim Rieger, Claus Escher, Gerhard Illian, Kazuya Nagao, Mikio Murakami, Tsuyoshi Uemura, Hiroyuki Ohnishi, Shozo Fujiwara