Vehicle communication system using existing roadway loops wherein the physical integrity of the loop is kept intact
Patent 5198811 Issued on March 30, 1993. Estimated Expiration Date: 
May 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 16, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3609247 Vehicle locating system Patent #: 4529982 InventorsAssigneeApplicationNo. 691199 filed on 05/16/1991US Classes:340/905, Highway information (e.g., weather, speed limits, etc.)340/941, Inductive455/41.1, Near field (i.e., inductive or capacitive coupling)455/99With vehicleExaminersPrimary: Ng, Jin F.Assistant: Hofsass, Jeffery Attorney, Agent or FirmInternational ClassG08G 001/09AbstractA 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 moving vehicle or as the transmitting antenna for signals generated by a transmitter located at the vehicle detector site for transfer to a receiver mounted on a moving vehicle. The information is encoded on a carrier having a frequency outside the normal frequency range of the vehicle detector system, preferably by interrupted carrier pattern processing.Field of SearchTransmitter in another vehicle (e.g., emergency vehicle)Relative distence between vehicles (e.g., collision alert) Transmitter in one vehicle only Highway information (e.g., weather, speed limits, etc.) Position indication transmitted by vehicle after receipt of information from local station Position indication transmitted at periodic intervals (e.g., distance travelled) Position indication transmitted by local station to remote location Prerecorded message describes position At remote location Frequency responsive actuation Inductive With vehicle | |
