Granted Patent
Utility
US 5,152,875 · App. 07/681,891
Separation of m- and p-dichlorobenzene
Inventors:
Siegbert Rittner, Adolf Schmidt, Rudolf Steiner, Leonhard Unverdorben
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Apr 8, 1991
Inventors
Siegbert Rittner
Adolf Schmidt
Rudolf Steiner
Leonhard Unverdorben
Assignee (at issue)
Hoechst GmbH
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.