Granted Patent
Utility
US 5,921,080 · App. 08/813,475
Oxidation catalytic converter system for small spark ignited engines
Inventors:
Vlad L. C. Ulmet, William J. Southgate
Patented Case
View Patent ↗
Granted: Jul 13, 1999
Filed: Mar 7, 1997
Inventors
Vlad L. C. Ulmet
William J. Southgate
Assignee (at issue)
The Lubrizol Corporation
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.