Granted Patent
Utility
US 4,284,878 · App. 06/068,116
Fluid level detector
Inventor:
Harold U. Bartels
Patented Case
View Patent ↗
Granted: Aug 18, 1981
Filed: Aug 20, 1979
Inventor
Harold U. Bartels
Assignee (at issue)
Bourns Medical Systems, Inc.
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.