Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9181844 | Diagnostic system and method for an oxygen sensor positioned downstream from a catalytic converter | Stephen Paul Levijoki, John W. Siekkinen, Jeffry A. Helmick | 2015-11-10 |
| 9096210 | Coordination of fuel cutoff for fault detection and hybrid operation | Christopher E. Whitney, Anthony H. Heap, John W. Siekkinen, Stephen Paul Levijoki | 2015-08-04 |
| 8939010 | System and method for diagnosing faults in an oxygen sensor | Stephen Paul Levijoki, Thomas J. Majcher, John W. Siekkinen, Scott Jeffrey | 2015-01-27 |
| 8014930 | System and method for determining oxygen sensor heater resistance | Igor Anilovich, John W. Siekkinen, Jens Vollstaedt, Michael Schellong, Per-Olof Blom | 2011-09-06 |