Granted Patent
Utility
US 4,682,157 · App. 06/833,188
Polar fluid detection system unaffected by power line voltages
Inventors:
Sara M. Mussmann, Roy E. Kidd
Patented Case
View Patent ↗
Granted: Jul 21, 1987
Filed: Feb 27, 1986
Inventors
Sara M. Mussmann
Roy E. Kidd
Assignee (at issue)
Emhart Industries, 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.