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| Number | Title | Issue Date |
| 5247297 | Vehicle detector method for multiple vehicle counting An estimate of the number of vehicles crossing a loop inductor having one or more interconnected discrete loops of the type found in vehicle detector system installations. A measuring signal follows changes in loop inductance caused by the influence of ve... | 09/21/1993 |
| 5198811 | Vehicle communication system using existing roadway loops wherein the physical integrity of the loop is kept intact A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a m... | 03/30/1993 |
| 5089815 | Vehicle communication system using existing roadway loops A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a m... | 02/18/1992 |
| 5028921 | Vehicle detector method and system A method of updating the reference count in a period shift measurement vehicle detector permits conditional reference count updating in the No Call direction whenever the sample count minus reference count difference value lies between the upper limit of ... | 07/02/1991 |
| 4996716 | Vehicle communication system using existing roadway loops A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a m... | 02/26/1991 |
| 4731867 | Vehicle communication system using existing roadway loops A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a m... | 03/15/1988 |
