Granted Patent
Utility
US 4,690,227 · App. 06/738,617
Gun firing head
Inventors:
Flint R. George, Marlin R. Smith
Patented Case
View Patent ↗
Granted: Sep 1, 1987
Filed: May 28, 1985
Inventors
Flint R. George
Marlin R. Smith
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.