Granted Patent
Utility
US 4,152,691 · App. 05/836,633
Seismic recording method using separate recording units for each group
Inventor:
Phillip W. Ward
Patented Case
View Patent ↗
Granted: May 1, 1979
Filed: Sep 26, 1977
Inventor
Phillip W. Ward
Assignee (at issue)
Texas Instruments Incorporated
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.