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| Number | Title | Issue Date |
| 7498946 | Ultrasonic transmitter and receiver systems and products using the same A transceiver preferably embedded within a wearable security watch, PDA, or other device which achieves a variety of wireless ultrasonic and/or radio-frequency based functions, including digital identification and proximity and sensation monitoring of assets, indivi... | 03/03/2009 |
| 7061381 | Ultrasonic transmitter and receiver systems and products using the same A transceiver preferably embedded within a wearable security watch, PDA, or other device which achieves a variety of wireless ultrasonic and/or radio-frequency based functions, including digital identification and proximity and sensation monitoring of assets, indivi... | 06/13/2006 |
