Patents by Inventor Halmut Kraus

Halmut Kraus 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 .mu.-amino-acrylic acid esters
    Patent number: 5030747
    Abstract: .beta.-Amino-acrylic acid esters of the formula(R.sup.1 R.sup.2)NCH.dbd.CR.sup.3 --COOR.sup.4can be obtained by reaction of .beta.-hydroxy-acrylic acid ester alkali metal salts of the formulaMe.sup..sym. .crclbar. OCH.dbd.CR.sup.3 --COOR.sup.4with ammonium salts of the formula(R.sup.1 R.sup.2) NH.sub.2.sup..sym. .crclbar.according to the general reaction equation(R.sup.1 R.sup.2) NH.sub.2 X+MeOCH.dbd.CR.sup.3 --COOR.sup.4 .fwdarw.(R.sup.1 R.sup.2) NCH.dbd.CR.sup.3 --COOR.sup.4 +MeX.dbd.H.sub.2 OR.sup.1, R.sup.2, R.sup.3, R.sup.4, Me.sup..sym. and X.sup..crclbar. having the meaning indicated in the description and the reaction being carried out in an aprotic organic solvent, in which the reaction components are suspended, as the reaction medium and it being possible to replace a part of the aprotic organic solvent by a protic organic solvent which is miscible with the aprotic solvent to give a homogeneous phase.
    Type: Grant
    Filed: March 19, 1990
    Date of Patent: July 9, 1991
    Assignee: Bayer Aktiengesellschaft
    Inventors: Heinz U. Blank, Erich Wolters, Friedrich-Wilhelm Ullrich, Halmut Kraus, Gerhard Marzolph, Gunter Silber