Patents by Inventor Annette Prelle

Annette Prelle 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 1,4,7,10-tetraazacyclododecane and its derivatives
    Patent number: 5744616
    Abstract: A process for the production of 1,4,7,10-tetraazacyclododecane (cyclene) and its derivatives on an industrial scale comprises cyclotetramerizing of benzylaziridine that is produced in situ.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: April 28, 1998
    Assignee: Schering Aktiengesellschaft
    Inventors: Orlin Petrov, Annette Prelle, Klaus Graske, Klaus Nickisch, Bernd Raduchel, Johannes Platzek
  • Process for the production of 1-methyl-3-keto-.DELTA..sup.1,4 steroids
    Patent number: 5523428
    Abstract: A process for the production of 1-methyl-3-keto-.DELTA..sup.1,4 steroids of general formula I ##STR1## in which St symbolizes the radical of asteroid molecule, where a 3-keto-.DELTA..sup.1,4 steroid of general formula II ##STR2## in which St has the above-mentioned meaning, is reacted in an inert solvent in the presence of a nickel salt soluble therein with an organometallic compound of formula III, IV or V ##STR3## where X, Y.sub.1, Y.sub.2, Y.sub.3, Z.sub.1 and Z.sub.2 are as defined in the specification.
    Type: Grant
    Filed: April 18, 1995
    Date of Patent: June 4, 1996
    Assignee: Schering Aktiengesellschaft
    Inventors: Jurgen Westermann, Klaus Nickisch, Annette Prelle