Granted Patent
Utility
US 4,802,402 · App. 06/930,479
Cylinder having an internally-disposed drain valve
Inventor:
Larry K. Rogers
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: Nov 14, 1986
Inventor
Larry K. Rogers
Assignee (at issue)
American Standard 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.