Granted Patent
Utility
US 4,286,208 · App. 06/110,009
Fluid interface detector
Inventors:
George French, John S. Oliver
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jan 7, 1980
Inventors
George French
John S. Oliver
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.