Granted Patent
Utility
US 4,711,678 · App. 06/857,138
Process for the preparation of a water-in-oil emulsion explosive and a fuel phase for use in such process
Inventor:
Hans Ehrnstrom
Patented Case
View Patent ↗
Granted: Dec 8, 1987
Filed: Apr 29, 1986
Inventor
Hans Ehrnstrom
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.