Granted Patent
Utility
US 4,455,051 · App. 06/273,865
Ratio control valve for tractor rear axles
Inventor:
Edward J. Falk
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: Jun 15, 1981
Inventor
Edward J. Falk
Assignee (at issue)
Echlin, 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.