Patents by Inventor Rolf Steinstrasser

Rolf Steinstrasser 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).

  • Biphenyl esters and liquid crystalline mixtures comprising them
    Patent number: 4136053
    Abstract: Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: January 23, 1979
    Assignee: Merck Patent Gesellschaft mit beschankter Haftung
    Inventors: Rolf Steinstrasser, Fernando DEL Pino
  • Biphenyl esters and liquid crystalline mixtures comprising them
    Patent number: 4065489
    Abstract: Biphenyl esters of the formula ##STR1## wherein X is --CO--O-- or --O--CO-- and R.sub.1 and R.sub.2 each are alkyl or alkoxy of 1 - 8 carbon atoms, enlarge significantly the temperature range of the nematic phase of liquid-crystalline compositions without adversely affecting other properties.
    Type: Grant
    Filed: October 21, 1975
    Date of Patent: December 27, 1977
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Rolf Steinstrasser, Fernando Del Pino