Granted Patent
Utility
US 5,154,204 · App. 07/732,887
Automatic drain valve for a compressed air system
Inventor:
Michael Hatzikazakis
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Jul 19, 1991
Inventor
Michael Hatzikazakis
Assignee (at issue)
Westinghouse Air Brake Co.
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.