Granted Patent
Utility
US 5,162,793 · App. 07/792,539
Drain plug absence indicator
Inventors:
Gerald N. Plost, Henry A. Hodgson
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: Nov 12, 1991
Inventors
Gerald N. Plost
Henry A. Hodgson
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.