Granted Patent
Utility
US 4,931,660 · App. 07/127,072
Apparatus for measuring foreign substance content in flowing liquids
Inventor:
Juergen Mayer
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Dec 1, 1987
Inventor
Juergen Mayer
Assignee (at issue)
Leybold 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.