Granted Patent
Utility
US 5,889,228 · App. 08/831,664
Detonator with loosely packed ignition charge and method of assembly
Inventors:
David W. Ewick, Brendan Michael Walsh
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: Apr 9, 1997
Inventors
David W. Ewick
Brendan Michael Walsh
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.