Granted Patent
Utility
US 4,793,238 · App. 07/068,494
Control signal blocking direction control valve in load-sensing circuit
Inventor:
Tadeusz Budzich
Patented Case
View Patent ↗
Granted: Dec 27, 1988
Filed: Jul 1, 1987
Inventor
Tadeusz Budzich
Assignee (at issue)
Caterpillar 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.