Issued Patents All Time
Showing 26–29 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7401592 | Hybrid exhaust valve assembly | Robin Willats, Joseph Callahan, Govindaraj Kalyanasamy | 2008-07-22 |
| 7243623 | Velocity control of exhaust valve actuation | Joseph Callahan | 2007-07-17 |
| 7155333 | Method and apparatus for controlling sound of an engine by sound frequency analysis | Joe Callahan, Ivan Arbuckle, Robin Willats | 2006-12-26 |
| 5875752 | Engine drive train having a front gear train with improved torsional dynamics | Alan H. Zhao, Thomas E. Reinhart, Mark A. Zen Ruffinen, Paul A. Hayes | 1999-03-02 |