Granted Patent
Utility
US 5,431,042 · App. 08/209,327
Engine emissions analyzer
Inventors:
David K. Lambert, Peter John Groblicki
Patented Case
View Patent ↗
Granted: Jul 11, 1995
Filed: Mar 10, 1994
Inventors
David K. Lambert
Peter John Groblicki
Assignee (at issue)
General Motors 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.