Granted Patent
Utility
US 4,996,161 · App. 07/109,815
Breath alcohol testing system
Inventors:
Patrick Conners, Lawrence R. Stevens, Don R. Gaiser, Frank C. Pennypacker
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Oct 16, 1987
Inventors
Patrick Conners
Lawrence R. Stevens
Don R. Gaiser
Frank C. Pennypacker
Assignee (at issue)
Guardian Technologies LLC
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.