Granted Patent
Utility
US 4,821,645 · App. 07/072,544
Multi-directional signal transmission in a blast initiation system
Inventor:
Peter Reiss
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Jul 13, 1987
Inventor
Peter Reiss
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.