Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7489993 | Vehicle tracking, communication and fleet management system | John Coffee, Robert W. Lewis, Kevin Marvin | 2009-02-10 |
| 6892131 | Vehicle tracking, communication and fleet management system | John Coffee, Richard Rudow, Robert F. Allen, Mark Billings, Mark Louis Kirchner +4 more | 2005-05-10 |
| 6611755 | Vehicle tracking, communication and fleet management system | John Coffee, Richard Rudow, Robert F. Allen, Mark Billings, Mark Louis Kirchner +4 more | 2003-08-26 |
| 6052605 | Continuous interference assessment and avoidance in a land mobile radio system | Sheldon Kent Meredith | 2000-04-18 |
| 5913177 | Traffic distribution analysis in a land mobile radio system | Sheldon Kent Meredith | 1999-06-15 |
| 5457749 | Electronic muffler | John A. Cain, Dennis Barnes | 1995-10-10 |
| 5272286 | Single cavity automobile muffler | John Cain, Dennis Barnes | 1993-12-21 |
| 5133017 | Noise suppression system | John Cain, Jamie Chait, Dennis Barnes | 1992-07-21 |