Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7728725 | Intrusion detection system for underground/above ground applications using radio frequency identification transponders | — | 2010-06-01 |
| 7069160 | Intrusion detection system and method thereof | — | 2006-06-27 |
| 6742714 | Proximity card with incorporated PIN code protection | Charles A. Walton | 2004-06-01 |
| 6340116 | Proximity card with incorporated pin code protection | Charles A. Walton | 2002-01-22 |
| 5896215 | Multi-channel system with multiple information sources | Charles A. Walton | 1999-04-20 |
| 5139179 | Apparatus for dispensing and preserving liquids | — | 1992-08-18 |