Granted Patent
Utility
US 4,858,205 · App. 07/236,694
Multi-barrel air gun module
Inventor:
Earnest R. Harrison
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Aug 24, 1988
Inventor
Earnest R. Harrison
Assignee (at issue)
Halliburton Geophysical Services, Inc.
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.