Granted Patent
Utility
US 5,234,632 · App. 07/783,687
Aeration apparatus for liquid
Inventor:
Hans Schmidt
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Oct 30, 1991
Inventor
Hans Schmidt
Assignees (at issue)
Berthold Schreiber
Erhard Schreiber
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.