Granted Patent
Utility
US 5,271,779 · App. 07/798,956
Making a reduced volume strength blasting composition
Inventor:
Bjorn Engsbraten
Patented Case
View Patent ↗
Granted: Dec 21, 1993
Filed: Nov 27, 1991
Inventor
Bjorn Engsbraten
Assignee (at issue)
Nitro Nobel AB
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.