Granted Patent
Utility
US 5,094,403 · App. 07/505,862
Shotcrete gun
Inventor:
Otto Tschumi
Patented Case
View Patent ↗
Granted: Mar 10, 1992
Filed: Apr 6, 1990
Inventor
Otto Tschumi
Assignee (at issue)
Sandoz AG
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.