Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6367298 | Key assembly for vehicle ignition locks | David C. Janssen, Ronald J. McGuire, Glenn A. Niles | 2002-04-09 |
| 6367299 | Key assembly for vehicle ignition locks | David C. Janssen | 2002-04-09 |
| 6035677 | Key assembly for vehicle ignition locks | David C. Janssen | 2000-03-14 |
| 5433096 | Key assembly for vehicle ignition locks | David C. Janssen | 1995-07-18 |