Granted Patent
Utility
US 4,225,193 · App. 06/035,117
Control valve arrangement for combined brake cylinder and reservoir
Inventor:
James E. Hart
Patented Case
View Patent ↗
Granted: Sep 30, 1980
Filed: May 1, 1979
Inventor
James E. Hart
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.