Granted Patent
Utility
US 4,327,768 · App. 06/205,203
Bottom outlet valve open and closed indicator
Inventor:
Gunter R. Behle
Patented Case
View Patent ↗
Granted: May 4, 1982
Filed: Nov 10, 1980
Inventor
Gunter R. Behle
Assignee (at issue)
ACF Industries Incorporated
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.