Granted Patent
Utility
US 5,614,693 · App. 08/548,812
Accessory charges for booster explosive devices
Inventor:
Brendan Welch
Patented Case
View Patent ↗
Granted: Mar 25, 1997
Filed: Jan 11, 1996
Inventor
Brendan Welch
Assignee (at issue)
The Ensign-Bickford Company
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.