Granted Patent
Utility
US 4,997,496 · App. 07/365,346
Explosive and propellant composition and method
Inventor:
Pius Anton Wehrli
Patented Case
View Patent ↗
Granted: Mar 5, 1991
Filed: Jun 13, 1989
Inventor
Pius Anton Wehrli
Assignee (at issue)
HOFFMANN-LA ROCHE INC.
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.