Patents by Inventor Gerhard Hempel, deceased

Gerhard Hempel, deceased 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 21-bromo-4-pregnene-3,20-dione derivatives
    Patent number: 5332847
    Abstract: A process is disclosed for the preparation of 21-bromo-4-pregnene-3,20-dione derivatives of general Formula I ##STR1## wherein R.sub.1 is a hydrogen atom, a hydroxy group or an alkanoyl group of up to 6 carbon atoms,R.sub.2 symbolizes a hydrogen atom or a methyl group, or whereinR.sub.1 and R.sub.2 jointly mean an isopropylidenedioxy group,whereinR.sub.3 is a hydrogen atom, a fluorine atom or a methyl group,V is a methylene group or ethylene group,X is a hydrogen atom, a fluorine atom or a chlorine atom, andY is a methylene group, a hydroxymethylene group or a carbonyl group.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: July 26, 1994
    Assignee: Schering Aktiengesellschaft
    Inventor: Gerhard Hempel, deceased