Granted Patent
Utility
US 4,516,230 · App. 06/508,232
Protective drive-level limiter for an electro-hydraulic vibrator
Inventors:
Kent J. Goodloe, Ralph A. Landrum, Jr.
Patented Case
View Patent ↗
Granted: May 7, 1985
Filed: Aug 5, 1983
Inventors
Kent J. Goodloe
Ralph A. Landrum, Jr.
Assignee (at issue)
Western Geophysical Company of America
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.