Granted Patent
Utility
US 5,323,331 · App. 08/145,671
Method and circuit arrangement for level monitoring
Inventors:
Heinrich Schenk, Dirk Schnabel
Patented Case
View Patent ↗
Granted: Jun 21, 1994
Filed: Nov 4, 1993
Inventors
Heinrich Schenk
Dirk Schnabel
Assignee (at issue)
Siemens Aktiengesellschaft
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.