Patents by Inventor David W. Polis

David W. Polis 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).

  • Polarizer films comprising aromatic liquid crystalline polymers comprising dichroic dyes in their main chains
    Patent number: 5746949
    Abstract: This invention provides novel liquid crystalline polymers which comprise, in the repeat units of their main chains, residues of suitable dichroic dyes. The polymers yield polarizer films with superior polarizing efficiency, transmittance, dichroic ratio, and thermal and humidity stability. The invention further discloses suitable processes to prepare such polymers and polarizer films therefrom.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: May 5, 1998
    Assignee: Hoechst Celanese Corp.
    Inventors: Sunny S. Shen, David W. Polis, Hyun N. Yoon, Tze-Pei Tien
  • Process for preparing quinones
    Patent number: 5672725
    Abstract: The invention provides a novel process to oxidize 1,4-dihydroxy aromatic compounds into the corresponding quinones using sulfuryl chloride as the oxidant. The process is simple and cost effective and provides an efficient way to synthesize hindered quinones.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: September 30, 1997
    Assignee: Hoechst Celanese Corp.
    Inventor: David W. Polis