Granted Patent
Utility
US 5,128,908 · App. 07/608,834
Pressure feedback servovalve for a seismic vibrator
Inventor:
Dennis K. Reust
Patented Case
View Patent ↗
Granted: Jul 7, 1992
Filed: Nov 5, 1990
Inventor
Dennis K. Reust
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.