Granted Patent
Utility
US 4,296,827 · App. 05/922,952
Air-gun fire time sensor
Inventors:
Ben B. Thigpen, James A. Porter
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Jul 10, 1978
Inventors
Ben B. Thigpen
James A. Porter
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.