Granted Patent
Utility
US 4,637,478 · App. 06/763,108
Gravity oriented perforating gun for use in slanted boreholes
Inventor:
Flint R. George
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Aug 7, 1985
Inventor
Flint R. George
Assignee (at issue)
Halliburton
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.