Granted Patent
Utility
US 4,252,379 · App. 06/105,385
Brake pressure control valve including failure warning mechanism
Inventor:
Edward J. Falk
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Dec 19, 1979
Inventor
Edward J. Falk
Assignee (at issue)
Wagner Electric Corporation
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.