Beacon tracking receiver
Patent 4001828 Issued on January 4, 1977. Estimated Expiration Date: 
January 4, 1994. 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.
January 4, 1994. 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 3005198 3213453 3296619 3540053 InventorAssigneeApplicationNo. 563983 filed on 04/02/1975US Classes:342/446, Unequal distance between at least three antennas342/419, Portable342/443, Having a direction indicator342/457, Land vehicle location (e.g., bus, police car342/458DistanceExaminersPrimary: Tubbesing, T. H.Assistant: Blum, T. M. Attorney, Agent or FirmAbstractA radio frequency receiver is responsive to signals radiated by a remote transmitter. The receiver includes at least one pair of antennas separated by approximately one-half wavelength at the transmitter frequency. The phases of the signals detected by the antennas are compared for the purpose of determining the relative direction to the transmitter. | |
