Patents by Inventor Reinhard Hopf

Reinhard Hopf 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).

  • Nitrogen-containing heterocycles
    Patent number: 5389290
    Abstract: Optically active nitrogen-containing heterocycles of the formula I according to claim 1 are suitable as components for ferroelectric liquid crystalline materials.
    Type: Grant
    Filed: December 17, 1991
    Date of Patent: February 14, 1995
    Assignee: Merck Patent Gesellschaft mit Beschrankter Haftung
    Inventors: Joachim Krause, Rudolf Eidenschink, Klaus Bofinger, Reinhard Hopf, Volker Reiffenrath, Eike Poetsch, Bernhard Scheuble, Thomas Geelhaar
  • Smectic liquid crystal phases
    Patent number: 5279762
    Abstract: Compounds of the formula IR.sup.1 --A.sup.1 --A.sup.2 --R.sup.2 IwhereinR.sup.1 and R.sup.2 are each alkyl with 1-15 C atoms, and wherein one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O--, --CO--S--, --S--CO--, --CHHalogen--, --CHCN-- and/or --CH.dbd.CH--,A.sup.1 is 1,4-phenylene, trans-1,4-cyclohexylene or a single bond andA.sup.2 is ##STR1## in which Z is --O--CO--, --CO--O--, --S--CO--, --CO--S--, CH.sub.2 O--, --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --, with the proviso that, if A.sup.1 is a single bond, A.sup.2 is ##STR2## are suitable as components of chirally tilted smectic liquid crystal phases.
    Type: Grant
    Filed: August 16, 1991
    Date of Patent: January 18, 1994
    Assignee: Merck Patent Gesellschaft Mit Beschrankter Haftung
    Inventors: Reinhard Hopf, Bernhard Scheuble, Reinhard Hittich, Joachim Krause, Volker Reiffenrath, Eike Poetsch, Thomas Geelhaar, Rudolf Eidenschink
  • Chiral compounds
    Patent number: 5180521
    Abstract: Optically active compounds of the formula I can be used as components of chiral tilted smectic liquid crystal phases.
    Type: Grant
    Filed: July 2, 1990
    Date of Patent: January 19, 1993
    Assignee: Merck Patent Gesellschaft mit beschraenkter Haftung
    Inventors: Rudolf Eidenschink, Reinhard Hopf, Eike Poetsch
  • Nitrogen-containing heterocycles
    Patent number: 5089168
    Abstract: Optically active nitrogen-containing heterocycles of the formula I according to claim 1 are suitable as components for ferroelectric liquid crystalline materials.
    Type: Grant
    Filed: May 16, 1989
    Date of Patent: February 18, 1992
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Joachim Krause, Rudolf Eidenschink, Klaus Bofinger, Reinhard Hopf, Volker Reiffenrath, Eike Poetsch, Bernhard Scheuble, Thomas Geelhaar
  • Smectic liquid-crystalline phases
    Patent number: 5075032
    Abstract: The invention relates to the use of compounds of the formula IR.sup.1 -Q.sup.1 -A-(Q.sup.2).sub.q -R.sup.2 IwhereinA denotes ##STR1## and R.sup.1, R.sup.2, Q.sup.1, Q.sup.2 and q have the meaning specified in claim 1, as components of smectic liquid-crystalline phases, and also smectic liquid-crystalline phases, in particular chiral tilted smectic phases containing compounds of formula I.
    Type: Grant
    Filed: August 18, 1989
    Date of Patent: December 24, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reinhard Hopf, Bernhard Scheuble, Andreas Wachtler
  • Smectic liquid crystal phases
    Patent number: 5064566
    Abstract: Compounds of the formula IR.sup.1 -A.sup.1 -A.sup.2 -R.sup.2 IwhereinR.sup.1 and R.sup.2 are each alkyl with 1-15 C atoms, and wherein one or two non-adjacent CH.sub.2 groups can also be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O--, --CO--S--, --S--CO--, --CHHalogen--, --CHCN-- and/or --CH.dbd.CH--,A.sup.1 is 1,4-phenylene, trans-1,4-cyclohexylene or a single bond andA.sup.2 is ##STR1## in which Z is --O--CO--, --CO--O--, --S--CO--, --CO--S--, CH.sub.2 O--, --OCH.sub.2 -- or --CH.sub.2 CH.sub.2 --, with the proviso that, if A.sup.1 is a single bond, A.sup.2 is ##STR2## are suitable as components of chirally tilted smectic liquid crystal phases.
    Type: Grant
    Filed: October 20, 1989
    Date of Patent: November 12, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reinhard Hopf, Bernhard Scheuble, Reinhard Hittich, Joachim Krause, Volker Reiffenrath, Eike Poetsch, Thomas Geelhaar, Rudolf Eidenschink
  • Smectic liquid-crystalline phases
    Patent number: 5055221
    Abstract: Compounds of the formula I,R.sup.1 --A.sup.1 --Z.sup.1 --A.sup.2 --[Z.sup.2 --A.sup.3 ].sub.m --R.sup.2 Iin which R.sup.1, R.sup.2, A.sup.1, A.sup.2, A.sup.3, Z.sup.1, Z.sup.2 and m have the meaning specified in patent claim 1, are suitable as components of smectic liquid-crystalline phases.
    Type: Grant
    Filed: June 5, 1989
    Date of Patent: October 8, 1991
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Bernhard Scheuble, Klaus Bofinger, Reinhard Hopf, Axel Pausch, Rudolf Eidenschink, Joachim Krause, Andreas Wachtler
  • Smectic liquid-crystalline phases
    Patent number: 4886620
    Abstract: The invention relates to the use of compounds of the formula IR.sup.1 --Q.sup.1 --A--(A.sup.2).sub.q --R.sup.2 Iwherein ##STR1## and R.sup.1, R.sup.2, Q.sup.1, Q.sup.2 and q have the meaning specified in claim 1, as components of smectic liquid-crystalline phases, and also smectic liquid-crystalline phases, in particular chiral tilted smectic phases containing compounds of formula I.
    Type: Grant
    Filed: May 13, 1987
    Date of Patent: December 12, 1989
    Assignee: Merck Patent Gesellschaft mit beschrankter Haftung
    Inventors: Reinhard Hopf, Bernhard Scheuble, Andreas Wachtler, Reinhard Hittich, Rudolf Eidenschink, Thomas Geelhaar, Joachim Krause, Volker Reiffenrath
  • Method and apparatus for classifying audio signals
    Patent number: 4542525
    Abstract: The null transitions of an audio frequency signal are converted by Schmitt trigger circuits, one of which has a small hysteresis range centered on the null value and the other of which has a much larger hysteresis range likewise centered on the null value, into two binary pulse sequences of variable pulse lengths. The Schmitt trigger circuits are so constituted that a positive pulse length is produced by a negative null transition of the audio signal and vice versa and, moreover, the Schmitt trigger circuits return to their quiescent state 2 milliseconds after a positive null transition of the signal, also producing a positive pulse length, in this case beginning the indication of the pause.
    Type: Grant
    Filed: September 27, 1983
    Date of Patent: September 17, 1985
    Assignee: Blaupunkt-Werke GmbH
    Inventor: Reinhard Hopf
  • Circuit for automatic selection between speech and music sound signals
    Patent number: 4541110
    Abstract: Speech versus music is decided by comparing the presence of pauses greater than 32, 60 and 500 ms in the lower input spectrum, and 4 ms in the higher input spectrum.
    Type: Grant
    Filed: January 21, 1982
    Date of Patent: September 10, 1985
    Assignee: Blaupunkt-Werke GmbH
    Inventors: Reinhard Hopf, Jean-Francois Longchamp