Granted Patent
Utility
US 4,213,713 · App. 05/962,110
One piece agitator for closed vessel
Inventors:
Hugo Kaessner, Wilhelm Loehr
Patented Case
View Patent ↗
Granted: Jul 22, 1980
Filed: Nov 20, 1978
Inventors
Hugo Kaessner
Wilhelm Loehr
Assignee (at issue)
Pfaudler-Werke 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.