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| Number | Title | Issue Date |
| 4388524 | Electronic identification and recognition system with code changeable reactance An electronic identification and recognition system in which the recognition portion includes a voltage controlled oscillator which sweeps over a range of frequencies. The identification portion resonates at certain frequencies determined by a variable re... | 06/14/1983 |
| 4384288 | Portable radio frequency emitting identifier An automatic identification system wherein a portable identifier, preferably shaped like a credit card, incorporates an oscillator and encoder so as to generate a programmable pulse position-modulated signal in the radio frequency range for identification... | 05/17/1983 |
| 4354189 | Switch and lock activating system and method A system and method are provided for opening a lock or activating a switch by electronically controlled means. In one form, a finger ring is provided which contains a code recording supported within or adjacent the crown thereof. When the hand of the pers... | 10/12/1982 |
| 4353064 | Battery operated access control card An access control card for use in an access control system. A battery, a wireless signal sensor such as an antenna for receiving coded wireless signals such as coded radio frequency signals generated by a card reader, a clock connected to the battery and ... | 10/05/1982 |
| 4106006 | Dual-frequency induction-keyed control circuit with keying network having variable resonant frequency A dual-frequency keyable control circuit is triggered into providing an electrical control output signal when two passive keying circuits, tuned to the correct radio frequencies are brought close enough to a sensing element of the keyable control circuit ... | 08/08/1978 |
| 3970824 | Electronic recognition and identification system for identifying a family of codes An electronic recognition and identification system for recognizing and identifying any one of a family of electrically-coded external objects. The system comprises internal electronics including a pulse widening circuit which enables the system to be res... | 07/20/1976 |
| 3958105 | Electronic recognition and identification system for identifying several master keys An electronic recognition and identification system for identifying one of a plurality of electrically coded keys, each having at least one tuned electrical circuit which is resonant at at least one of a plurality of predetermined frequencies. The system ... | 05/18/1976 |
