Granted Patent
Utility
US 5,228,010 · App. 07/723,137
Seismic energy source air gun
Inventor:
E. R. Harrison
Patented Case
View Patent ↗
Granted: Jul 13, 1993
Filed: Jun 28, 1991
Inventor
E. 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.