Granted Patent
Utility
US 4,328,751 · App. 06/146,192
Electronic delay blasting circuit
Inventor:
Gerald L. Oswald
Patented Case
View Patent ↗
Granted: May 11, 1982
Filed: May 5, 1980
Inventor
Gerald L. Oswald
Assignee (at issue)
Atlas Powder 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.