Granted Patent
Utility
US 4,253,164 · App. 05/956,476
Multi-purpose seismic transducer
Inventor:
Ernest M. Hall, Jr.
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Oct 30, 1978
Inventor
Ernest M. Hall, 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.