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| Number | Title | Issue Date |
| 5850187 | Integrated electronic tag reader and wireless communication link A method and apparatus for object identification which includes a portable electronic tag reader having a transceiver capable both of reading identification information from electronic tags and transmitting collected information to a base unit for remote ... | 12/15/1998 |
| 5828693 | Spread spectrum frequency hopping reader system An apparatus for sourcing an interrogation signal for use in a object identification system including a frequency hopping source for generation of an interrogation signal which is coupled to a homo dyne radio for transmission by a bi-directional antenna t... | 10/27/1998 |
| 5825329 | Modulated backscatter microstrip patch antenna The invention provides a microstrip patch antenna for emitting backscatter-modulated signals in response to a received signal. The antenna has two segments that are connected together by a switch. When the switch is ON, the antenna is a full wave length a... | 10/20/1998 |
| 5771021 | Transponder employing modulated backscatter microstrip double patch antenna A reader interrogates a transponder attached to a remote object. The transponder includes a microstrip patch antenna having two segments connected together by a switch, each segment being one-half wavelength, the antenna being a full wavelength at the fre... | 06/23/1998 |
| 5737710 | Automated vehicle parking system for a plurality of remote parking facilities An automated vehicle parking system for a plurality of remote parking facilities that communicates with a vehicle approaching or leaving the remote facility with RF signals, or the like, that identifies the vehicle and sends the vehicle identification num... | 04/07/1998 |
| 5485520 | Automatic real-time highway toll collection from moving vehicles One or more roadside collection stations (RCS) communicate over a short-range, high speed bidirectional microwave communication link with one or more in-vehicle units (IVU) associated with one or more respectively corresponding vehicles in one or more tra... | 01/16/1996 |
| 5479160 | Low level RF threshold detector A low power circuit which detects low level RF signals and RF signals of varying strength and, upon detection, activates or "wakes up" RF equipment, such as an automatic vehicle identification tag, that is normally kept in a dormant state to conserve oper... | 12/26/1995 |
| 4816839 | Transponder antenna An antenna in a transponder receives signals from a reader, modulates them, and reflects them back to a reader to pass the information contained in the transponder to the reader. The system includes a thin planar dielectric material having first and secon... | 03/28/1989 |
