Patents by Inventor Norbert Linkat

Norbert Linkat 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 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 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
  • 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