Granted Patent
Utility
US 4,995,925 · App. 07/313,471
Blasting composition
Inventor:
Bjorn Engsbraten
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Feb 22, 1989
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.