Patents Assigned to Degussa Aktiengesellschaft
  • Patent number: 6656290
    Abstract: A soldering paste for hard-soldering and coating working parts made of aluminum or aluminum alloys, which contains 25 to 35 percent in weight of a water-miscible organic binding agent on the basis of aliphatic glycols, 25 to 45 percent in weight of an aluminum hard-soldering powder, 25 to 45 percent in weight of an aluminum fluxing agent and, as an additive to influence the rheological properties, 0.01 to 0.2 percent by weight with respect to the total amount of one or several fatty acids with 10 to 20 C atoms and/or their ammonium salts.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: December 2, 2003
    Assignee: Degussa Aktiengesellschaft
    Inventors: Jürgen Koch, Leander Staab, Wolfgang Kohlweiler, Karl-Anton Starz
  • Patent number: 6576207
    Abstract: An oxygen storing material with high thermal stability is disclosed which contains cerium oxide and at least one stabilizer from the group praseodymium oxide, lanthanum oxide, yttrium oxide and neodymium oxide, wherein the stabilizer(s) and optionally cerium oxide are present in highly dispersed form on the specific surface area of a high surface area support material from the group aluminum oxide, zirconium oxide, titanium oxide, silicon dioxide, cerium oxide and mixed oxides thereof and the oxygen storing material still has a specific surface area of more than 20, preferably more than 30 m2/g, after calcination in air at 900° C. for a period of 10 hours.
    Type: Grant
    Filed: April 8, 1998
    Date of Patent: June 10, 2003
    Assignee: Degussa Aktiengesellschaft
    Inventors: Lothar Mussmann, Renee Van Yperen, Dieter Lindner, Thomas Kreuzer, Egbert Lox
  • Patent number: 6455705
    Abstract: A method of isolating 1-[N2-((S)-ethoxycarbonyl)-3-phenylpropyl)-N6-trifluoroacetyl]-L-lysyl-L-proline (lisinopril (TFA) ethyl ester, LPE). The solvent or solvent mixture used for the extraction is also a main constituent of the solvent or solvent mixture from which the crystallization takes place. High yield as well as good purity of the end product are obtained, without distillation. 1-[N2-((S)-ethoxycarbonyl)-3-phenylpropyl)-N6-trifluoroacetyl]-L-lysyl-L-proline (lisinopril (TFA) ethyl ester, LPE) is described as a precursor for producing an ACE inhibitor.
    Type: Grant
    Filed: December 24, 1998
    Date of Patent: September 24, 2002
    Assignee: Degussa Aktiengesellschaft
    Inventors: Matthias Kottenhahn, Roland Möller, Michael Kraft, Karlheinz Drauz, Klaus Stingl
  • Patent number: 6406532
    Abstract: A titanium dioxide powder/iron oxide mixed oxide which is prepared from FeCl3 and TiCl4 using a pyrogenic, especially a flame hydrolytic method. A further possibility is to coat pyrogenically, especially flame hydrolytically prepared titanium dioxide with iron oxide in aqueous dispersion. Both of these titanium dioxide powders which contain iron oxide may be used as a UV absorber in sunscreens.
    Type: Grant
    Filed: September 14, 1995
    Date of Patent: June 18, 2002
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Hartmann, Dieter Kerner
  • Patent number: 6333176
    Abstract: A plant peptide amidase from the flavedo of oranges is known; this can be obtained only in small quantities and is seasonal. The proposed new enzymes are microbial peptide amidases which can be obtained from micro-organisms recovered from soil samples in a “double screening” and grown. These microbial peptide amidases are particularly useful for (a) the production of peptides and N-terminal-protected amino acids, (b) racemate splitting of N-protected amino acid amides, (c) obtaining non-proteinogenous D-amino acids, and (d) obtaining new N&agr;-protected D-amino acid amides.
    Type: Grant
    Filed: August 25, 1999
    Date of Patent: December 25, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Ursula Stelkes-Ritter, Maria-Regina Kula, Klaudia Wyzgol, Andreas Bommarius, Michael Schwarm, Karlheinz Drauz
  • Patent number: 6331605
    Abstract: Oligomeric organosilanepolysulfanes which are built up from the three structural units A and/or B and/or C, in which Y=H, CN, —(CH2)nSiRR1R2; n=1-8, R, R1, R2 and R3, independently, represent H, (C1-C4)alkyl, (C1-C4)alkoxy, halogen or a OSiR1R2R3 group; x, as a statistical average, is 1-6, z, as a statistical average, is 2-6, n is 1-8 and o, p and q are each a whole, positive number between 1 and 40 where o+p+q may be ≧2 and <40, with the proviso that at least one structural unit A or B is present, and their use in rubber mixtures and to produce molded items, in particular pneumatic tires.
    Type: Grant
    Filed: June 10, 1999
    Date of Patent: December 18, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hans-Detlef Lunginsland, Christoph Batz-Sohn
  • Patent number: 6319528
    Abstract: The invention provides a feedstuff additive based on a fermentation broth obtained by the fermentation of D-pantothenic acid producing microorganisms. The broth contains D-pantothenic acid, one or more salts of D-pantothenic acid, or mixtures thereof.
    Type: Grant
    Filed: October 12, 2000
    Date of Patent: November 20, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Michael Binder, Klaus-Erich Uffmann, Iiona Walger, Ulrich Becker, Walter Pfefferle, Heinz Friedrich
  • Patent number: 6251625
    Abstract: The invention concerns a process for the enzymatic preparation of protected di- and oligopeptides and the separation of the protective groups used. The process according to the invention enables peptides to be synthesized simply and economically and the protective group to be separated carefully. The process comprises three reaction steps: 1. Preparation of N-carbamoyl amino acid or N-carbamoyl amino acid derivatives; 2. Formation of the peptide bond between the carbamoyl-protected electrophile and nucelophile; and 3. Separation of the carbamoyl-protective group.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: June 26, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Andreas Bommarius, Karlheinz Drauz, Uwe Eichhorn, Hans-Dieter Jakubke, Matthias Kottenhahn
  • Patent number: 6242234
    Abstract: The invention relates to new mutants of formate dehydrogenase from Candida boidinii, new gene sequences encoding these and use of the new formate dehydrogenases. The wild type FDH used hitherto in the industrial process for preparing amino acids becomes inactive after a certain time. New mutants of this wild type have been produced by targeted mutagenesis of a recombinant FDH from E. coli. The new mutants are preferably used in an enzymatic process for preparing chiral compounds.
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: June 5, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Maria-Regina Kula, Martina Pohl, Heike Slusarczyk
  • Patent number: 6229018
    Abstract: A process for the preparation of nicotinic acid by the direct oxidation of &bgr;-picoline in the gas phase, wherein water and &bgr;-picoline are fed separately to the catalyst bed and the catalyst is based on a titanium dioxide support which has been prepared by the sulfate method and has a high specific surface area and a vanadium oxide content of from 5 to 50 %.
    Type: Grant
    Filed: August 31, 1999
    Date of Patent: May 8, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Dieter Heinz, Wolfgang Hölderich, Steffen Krill, Wolfgang Böck, Klaus Huthmacher
  • Patent number: 6221294
    Abstract: Cyanuric chloride moldings, especially tablets and flakes, have advantages over powders in ease of handling. The moldings are produced by droplet or strip application of molten cyanuric chloride on to a surface and dissipation of the latent heat of fusion by cooling the surface or contacting the melt applied as droplets or strips with a cooling gas.
    Type: Grant
    Filed: June 15, 2000
    Date of Patent: April 24, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Ralf Goedecke, Klaus Hentschel, Rolf-Dieter Möller, Knut Ehrhardt, Manfred Schmidt, Michael Kissner
  • Patent number: 6184414
    Abstract: Process for producing ammonium-2-hydroxy-4-(methylthio)-butyrate, mixtures containing the same in liquid form and their use. In order to produce ammonium-2-hydroxy-4-methylthio-n-butyrate and mixtures containing the same with a remarkable fluidity and a very low oligomer proportion by a process based on exclusively “liquid” steps, the reaction mixture is treated with a water-immiscible or partially water-miscible inert solvent, until a first organic extract and a first aqueous raffinate are obtained, and the first organic extract is decomposed into a second organic extract and a second aqueous raffinate by treating it with ammonia and phase separation. Re-extraction of MHA as MHAAS is carried out in the second aqueous raffinate, causing salt formation, and MHAAS is isolated from the second aqueous raffinate. This compound is useful as feedstuff supplement and as methionine substitute.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: February 6, 2001
    Assignee: Degussa Aktiengesellschaft
    Inventors: Helmut Suchsland, Heinz Kohl
  • Patent number: 6158397
    Abstract: In order to reduce the soot content of a diesel engine's exhaust gas, a fluid containing a peroxide compound, preferably an aqueous hydrogen peroxide solution, is fed into the combustion chamber after the start of the injection and combustion of the fuel, preferably following the combustion phase. The diesel fuel is preferably injected in the range before top dead center and the fluid containing the peroxide compound is fed in the range to after top dead center. Use may be made for the alternate supply of diesel fuel and hydrogen peroxide of a shared injection nozzle (FIG. 1) which supplies one or other of the media depending on the pressure of the diesel fuel and hydrogen peroxide solution supplied.
    Type: Grant
    Filed: January 28, 1999
    Date of Patent: December 12, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Norbert Peters, Caroline Born, Christian Antoni, Tobias Plessing
  • Patent number: 6121499
    Abstract: A process for producing polyhydroxy ethers having the formula (I) (HO).sub.(w--M) W(OV).sub.m, in which W represents an organic group and OV a structural element containing hydroxyl groups, having the formula (III) ##STR1## A multifunctional alcohol W(OH).sub.w (II) is reacted with an .alpha.,.beta.-unsaturated carbonyl compound XCH.dbd.CY--CZ.dbd.O (IV) and formaldehyde in the presence of a base. The .alpha., .beta.-unsaturated carbonyl compound (IV) and the remaining quantities of formaldehyde, multifunctional alcohol (II) and base are added continuously or periodically to an aqueous solution or suspension containing at least 10 mole % of the multifunctional alcohol (II), at least 10 to 70 mole % of the formaldehyde and at least 10 mole % of the base. Preferred multifunctional alcohols (II) are pentaerythritol, TMP and TME. Preferred carbonyl compounds (IV) are acrolein and .alpha.-alkylacrolein. New asymmetric polyhydroxy ethers are also disclosed.
    Type: Grant
    Filed: March 3, 1998
    Date of Patent: September 19, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Marcus Morawietz, Dietrich Arntz, Mathias Hopp
  • Patent number: 6114163
    Abstract: The disclosure relates to a process for obtaining optically active L-.alpha.-aminocarboxylic acids from the corresponding racemic D,L,.alpha.-aminocarboxylic acids. The following steps are involved: (a) the D,L,.alpha.-aminocarboxylic acids are acetylated; (b) the N-acetyl-L-.alpha.-aminocarboxylic acid present in the mixture of N-acetyl-D,L,.alpha.-aminocarboxylic acids thus obtained is broken down enzymatically into the L-.alpha.-aminocarboxylic acid; (c) the L-.alpha.-aminocarboxylic acid is separated from the mixture, a quantity of a solution of N-acetyl-D(L)-.alpha.-aminocarboxylic acids and a quantity of acetate equivalent to the L-.alpha.-aminocarboxylic acid being retained; and (d) the N-acetyl-D(L)-.alpha.-aminocarboxylic acid is racemized and recycled for enzymatic breakdown. Known extraction processes involving steps (a) to (d) have the disadvantage of producing large quantities of salt.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: September 5, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karlheinz Drauz, Andreas Bommarius, Michael Karrenbauer, Gunter Knaup
  • Patent number: 6096173
    Abstract: A method of producing hydrogen cyanide by the gas-phase reaction of methane with ammonia at elevated temperature and an ammonia/methane ratio of 1.001 to 1.1. The conducting of the gaseous reaction mixture through a corona discharge causes the reaction to start at temperatures below C. without the action of a catalyst. This results in considerable savings of the necessary investment expenses as well as of the running costs for energy.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: August 1, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Lukas Von Hippel, Andreas Gutsch, Roland Schaffer, Manfred Sauer, Rudolf Vanheertum
  • Patent number: 6093823
    Abstract: The invention pertains to a process for the continuous production of basic cyclic optically active .alpha.-amino acids of general formula (I) by continuous racemate splitting via diastereomeric salt pairs with re-racemisation of the residual amino acid or amino acid derivative in the mother liquid with the aid of an optically active acid.
    Type: Grant
    Filed: March 24, 1998
    Date of Patent: July 25, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Matthias Kottenhahn, Klaus Stingl, Karlheinz Drauz
  • Patent number: 6080887
    Abstract: With known methods of racemizing N-acetyl-D(L)-.alpha.-amino carboxylic acids in the non-aqueous state by heating them to temperatures above room temperatures, significant quantities of by-products are formed, especially acetyl dipeptides. By converting at least a proportion of the N-acetyl-D(L)-.alpha.-amino carboxylic acids to corresponding N-acetyl-D(L)-.alpha.-amino carboxylic acid salts before or during the heating, it is possible to increase the sojourn time of the educt which is to be racemized at higher temperatures without any evident increase in the quantity of by-product formed (in particular acetylated dipeptides). Also disclosed is the production of optically active amino acids by enzymatic splitting of racemic compounds.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: June 27, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karlheinz Drauz, Michael Karrenbauer, Andreas Bommarius, Gunter Knaup
  • Patent number: 6080232
    Abstract: The invention relates to spherical colored pigments having an average particle diameter of less than 10 .mu.m on the basis of an oxide, a mixed oxide or a silicate. The pigments are obtainable by means of spray-pyrolysis technology: a solution containing oxide-forming or silicate-forming metal compounds is converted into an aerosol and the latter is fed, preferably after predrying, to a pyrolysis reactor; the pigment is separated from the pyrolysis gas. The colored pigments according to the invention are suitable for the production of ceramic decorations and for the coloring of plastics, synthetic foils, fibers and also lacquers. By reason of the spherical shape, unusual technical application properties are achieved.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: June 27, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Jorg Sperlich, Ralph Brandes, Hauke Jacobsen, Stipan Katusic, Andreas Schulz
  • Patent number: 6073467
    Abstract: Three-dimensional knitted catalyst gauzes made from noble metals have recently come into use for ammonia oxidation and other gaseous reactions. Particularly high yields accompanied by a stable course of the reaction and an extended service life of the catalyst gauze are achieved if the catalyst gauzes are knitted in two or more layers and the layers are connected together by pile threads. Important features are the largest possible number of pile threads per unit area and the alignment thereof as parallel as possible to the direction of flow of the reaction gases.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: June 13, 2000
    Assignee: Degussa Aktiengesellschaft
    Inventors: Siegfried Blass, Horst Dubler, Dietmar Konigs, Thomas Stoll, Harald Voss