Patents by Inventor Hans R. Kricheldorf

Hans R. Kricheldorf 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).

  • Cyclic polycarbonates and copolycarbonates,production and use thereof
    Publication number: 20060089483
    Abstract: A cyclic (co)polycarbonate resin is disclosed. The resin conforms structurally to general formulae (1a) or (1b), in which -D- and -E- independently denote an aromatic group having 6 to 40 C atoms, k stands for an integer from 1 to 4000 and m, n and o each independently of the other, stand for numbers from 1 to 4000. The resin is suitable for making a variety of useful articles.
    Type: Application
    Filed: January 9, 2004
    Publication date: April 27, 2006
    Inventors: Rolf Wehrmann, Helmut-Werner Heuer, Claus-Ludolf Schultz, Hans-R Kricheldorf
  • Process for the preparation of copolyesters
    Patent number: 6297350
    Abstract: Copolyesters are prepared using cyclic esters or carbonates as monomers and a metallic salt of the formula Me2+X2 as catalyst. Me2+ represents Ca, Fe(II), Mg, Mn(II) or Zn, and X is an anion of an aminocarboxylic acid, hydroxycarboxylic acid or a halide. Monomer and catalyst are used in a monomer/catalyst ratio of greater than 100.
    Type: Grant
    Filed: February 15, 2000
    Date of Patent: October 2, 2001
    Assignee: Ferring GmbH
    Inventors: Hans R. Kricheldorf, Ingrid Kreiser-Saunders, Dirk-Olaf Damrau
  • Chirally nematic polyesters
    Patent number: 6291629
    Abstract: Liquid crystalline chiral nematic polyesters have flexible chains comprising isosorbide, isomannide and/or isoidide units. The polyesters are not crystalline and form stable Grandjean textures which can be frozen on cooling below the glass transition temperature. They can therefore be used in particular as surface-coating materials.
    Type: Grant
    Filed: August 6, 1999
    Date of Patent: September 18, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans R. Kricheldorf, Thorsten Krawinkel, Andreas Gerken, Peter Schuhmacher
  • Chiral nematic polycarbonates
    Patent number: 6156866
    Abstract: A chiral nematic polycarbonate having carbonate units, of the formula Iwhere the w/x/y/z molar ratio is 1 to 20/1 to 5/0 to 10/0 to 10,A is a mesogenic group of the formula ##STR1## or ##STR2## ; and B is a chiral group.
    Type: Grant
    Filed: February 5, 1999
    Date of Patent: December 5, 2000
    Assignee: BASF Aktiengesellschaft
    Inventors: Peter Schuhmacher, Hans R. Kricheldorf, Shih-Jieh Sun
  • Chiral nematic polyesters
    Patent number: 5766679
    Abstract: Chiral nematic polyesters comprise as alcohol component chiral diol structural units and as acid component dicarboxylic acid residues comprising mesogenic groups. The polyesters are particularly suitable for surface coating.
    Type: Grant
    Filed: August 15, 1997
    Date of Patent: June 16, 1998
    Assignee: BASF Aktiengesellschaft
    Inventors: Karl Siemensmeyer, Frank Meyer, Karl-Heinz Etzbach, Hans R. Kricheldorf, Nicolas Probst
  • Stiff-chain polyheterocycles having improved solubility, a process for their production and their use
    Patent number: 5134219
    Abstract: The substituted polyheterocycles containing recurring structural units corresponding to the formula ##STR1## in which X is an oxygen atom, a sulfur atom or N-H, show good solubility in mixtures of methanesulfonic acid and methylene chloride or trifluoroacetic acid and methylene chloride. They may be used for the production of mixtures with thermoplastic polymers.
    Type: Grant
    Filed: November 26, 1990
    Date of Patent: July 28, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans R. Kricheldorf, Jurgen Engelhardt, Ralf Pakull, Volker Eckhardt, Ulrich Leyrer
  • Copolycarbonate from mixture of polyarylene diol
    Patent number: 5084550
    Abstract: The novel thermotropic polycarbonates having recurring structural units of the formulae ##STR1## have good mechanical properties and good processability. They can be used in conventional manner for manufacturing mouldings, filaments, fibres and films.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: January 28, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Pakull, Dieter Freitag, Volker Eckhardt, Karsten-Josef Idel, Hans R. Kricheldorf, Dierik Lubbers
  • Process for the preparation of polyimide esters of trimellitic acid
    Patent number: 4631333
    Abstract: This invention relates to a process for the preparation of polyimide esters starting from trimellitic acid anhydride and aminophenols or aminohydroxy biphenyls.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: December 23, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hans R. Kricheldorf, Ralf Pakull, Hans-Rudolf Dicke
  • Process for the production of aromatic ethers and aromatic polyethers
    Patent number: 4474932
    Abstract: Aromatic ethers or polyethers are produced by reacting aromatic fluorine compounds, in which one or more fluorine substituents are attached to an aromatic nucleus, with trialkyl silyl derivatives of phenols, in which one or more trialkyl silyl groups are attached to the residue of a mono- or polyphenol, or by reacting trialkyl silyl derivatives of fluorophenols with elimination of trialkylfluorosilane.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: October 2, 1984
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gerhard Bier, Hans R. Kricheldorf