Granted Patent
Utility
US 5,367,603 · App. 08/046,978
Smoke generator for firefighting trainers utilizing a metering venturi
Inventors:
William R. Wenrich, James J. Ernst
Patented Case
View Patent ↗
Granted: Nov 22, 1994
Filed: Apr 13, 1993
Inventors
William R. Wenrich
James J. Ernst
Assignee (at issue)
Symtron Systems, 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.