Patents by Inventor Gunter Bison

Gunter Bison 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).

  • Process for the production of 5-methyltetrazole
    Patent number: 4791210
    Abstract: 5-Methyltetrazole can be produced by reacting acetonitrile with an alkali azide or ammonium azide in high purity and a yield of above 98% by using a trialkyl amine as the solvent or suspension agent and by using the associated hydrochloride of the amine as the catalyst.
    Type: Grant
    Filed: October 13, 1987
    Date of Patent: December 13, 1988
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Johannes Schlupp, Josef Winterscheid, Klaus Thewalt
  • Process for producing the sodium salt of 2-nitro-1,3-propanediol
    Patent number: 4754079
    Abstract: A safe production of sodium nitro-1,3-propanediol from a reaction solution of nitromethane and paraformaldehyde in methanol by addition of sodium methylate is achieved by evaporative cooling of the methanol; it being possible to maintain reaction temperatures of 35.degree. C. to 50.degree. C.
    Type: Grant
    Filed: March 23, 1987
    Date of Patent: June 28, 1988
    Assignee: Dynamit Nobel AG
    Inventors: Gunter Bison, Hans Leuck, Klaus Thewalt, Hans-Jorg Westerman
  • Process for the preparation of dichloroisonitrilocarboxylic acid esters
    Patent number: 4652671
    Abstract: It is suggested to produce 5-chloro-1H-tetrazolecarboxylic acid esters by reaction of dichloroisonitriloacetic acid esters with alkali or metal azides or ammonium azide.The dichloroisonitriloacetic acid esters required for this purpose are formed by reacting N-formylaminocarboxylic acid esters with chlorine or with compounds which split off chlorine.
    Type: Grant
    Filed: September 12, 1985
    Date of Patent: March 24, 1987
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Norbert Linkat, Klaus Thewalt
  • Process for the preparation of 2-aminopropanediol-1,3(serinol)
    Patent number: 4448999
    Abstract: 2-Aminopropanediol-1,3 (serinol) can be prepared by hydrogenation of the alkali salt of 2-nitro-1,3-propanediol with assuredly high yields by maintaining a narrow range of temperatures of extending from 50.degree.-80.degree. C. by use of a cooling device.
    Type: Grant
    Filed: July 30, 1982
    Date of Patent: May 15, 1984
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Klaus Thewalt, Gunter Bison, Heinz Egger
  • Process for the preparation of 1H-tetrazole-1 compounds using trimethylsilyl azide
    Patent number: 4426531
    Abstract: A process for the preparation of 1H-tetrazole-1-acetic acid or its ester which comprises contacting trimethylsilyl azide with an orthocarboxylic acid ester of the formulaR.sub.1 C(OR).sub.3whereinR.sub.1 is hydrogen or C.sub.1-8 alkyl,R is alkyland glycine, an ester thereof, a salt thereof or an ester hydrochloride or the resultant imino ether obtained from reaction of glycine, its ester or salt and the orthocarboxylic acid ester.
    Type: Grant
    Filed: November 19, 1981
    Date of Patent: January 17, 1984
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Norbert Linkat, Wolfgang Wolfes
  • Method of racemizing optically active 1-phenylethylamine
    Patent number: 4252744
    Abstract: A process for the preparation of racemic phenylethylamine which comprises contacting an optical antipode therefore, e.g., L(-) or D(+)-1-phenylethylamine with sodium amide or sodium hydride.
    Type: Grant
    Filed: June 15, 1976
    Date of Patent: February 24, 1981
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Kurt Breideneichen, Walter Heinzelmann, Wolfgang Wolfes
  • Process for splitting the L-(-)-.alpha.-phenylethylamine salt of D-(-)-.alpha.-azidophenylacetic acid
    Patent number: 4190592
    Abstract: A process for splitting the L-(-)-.alpha.-phenylethylamine salt of D-(-)-.alpha.-azidophenylacetic acid which comprises the steps of mixing the salt with a liquid diluent and an acidic cation exchange material, effecting agitation of the resulting admixture and therefore isolating a highly purified D-(-)-.alpha.-azidophenylacetic acid. This acid product is characterized by an amine content of less than 0.2% by weight.
    Type: Grant
    Filed: September 26, 1975
    Date of Patent: February 26, 1980
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Reiner Elfgen, Walter Heinzelmann, Josef Winterscheid, Wolfgang Wolfes
  • Process for obtaining D(-)-and L(+)-.alpha.-azidophenylacetic acid
    Patent number: 3941814
    Abstract: L(+)- or D(-)-.alpha.-azidophenylacetic acid is produced by a process which involves the steps of reacting a water-soluble salt of DL-.alpha.-azidophenylacetic acid with a water-soluble salt of an optically active .alpha.-phenylethylamine in an aqueous medium, effecting crystallization of the resulting reaction product, that is, the diastereomeric salt, and splitting of the thus-obtained salt.
    Type: Grant
    Filed: July 29, 1974
    Date of Patent: March 2, 1976
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Hans Schubel, Gerhard Schmeling
  • Process for the production of pure tetrazole-1-acetic acid
    Patent number: 3932441
    Abstract: Process for producing tetrazole-1-acetic acid of maximum purity includes the steps of providing a crude reaction product containing an alkyl ester of tetrazole-1-acetic acid having from 1 to 4 carbon atoms in the alkyl group, effecting molecular distillation of this reaction product at a temperature below 130.degree.C. under a vacuum of 10.sup.-.sup.1 torr to obtain a distillant containing the alkyl ester and then gently hydrolyzing the resultant distillate to obtain the desired acid product.
    Type: Grant
    Filed: September 27, 1974
    Date of Patent: January 13, 1976
    Assignee: Dynamit Nobel Aktiengesellschaft
    Inventors: Gunter Bison, Walter Heinzelmann, Norbert Linkat, Wolfgang Wolfes