Patents by Inventor Franciscus J. Stommels

Franciscus J. Stommels 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).

  • Ferroelectric liquid crystal display having a spread of angles for grayscale and method of manufacture
    Patent number: 5151804
    Abstract: A liquid crystal device incorporating ferroelectric liquid crystal medium having smectic layers between two supporting plates provided with electrodes, the smectic layers exhibiting a spread of angles with respect to at least one of the supporting plates, whereby a gradual transmission/voltage characteristic is achieved. The spread of angles can be obtained by any of several techniques, such as subjecting the device to a low frequency electric field, or a local thermal, mechanical, chemical or magnetic treatment.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: September 29, 1992
    Assignee: U.S. Philips Corporation
    Inventors: Antonius G. H. Verhulst, Wilbert J. A. M. Hartmann, Franciscus J. Stommels, Ann M. M. Luyckx-Smolders