Granted Patent
Utility
US 4,952,734 · App. 07/210,633
Process for the preparation of methylamines
Inventors:
Jurgen Weber, Detlef Kampmann, Claus Kniep
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Jun 23, 1988
Inventors
Jurgen Weber
Detlef Kampmann
Claus Kniep
Assignee (at issue)
Hoechst AG Werk Ruhrchemie
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.