Granted Patent
Utility
US 4,431,386 · App. 06/326,893
Concrete-pump assembly
Inventors:
Jurgen O. Fehler, Rolf Griesbach, Franz-Hubert Geue
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Dec 2, 1981
Inventors
Jurgen O. Fehler
Rolf Griesbach
Franz-Hubert Geue
Assignee (at issue)
Elba-Werk Maschinengesellschaft mbH & Co.
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.