Granted Patent
Utility
US 5,423,214 · App. 08/222,169
Variable fluid and tilt level sensing probe system
Inventor:
Calvin Spencer Lee
Patented Case
View Patent ↗
Granted: Jun 13, 1995
Filed: Apr 4, 1994
Inventor
Calvin Spencer Lee
Assignee (at issue)
Calvin S. Lee
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.