Beacon tracking display system
Patent 4023176 Issued on May 10, 1977. Estimated Expiration Date: 
May 10, 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.
May 10, 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 3018369 3247502 3366958 3653049 3665380 3828341 3863256 3872477 3906503 InventorsAssigneeApplicationNo. 05/564401 filed on 04/02/1975US Classes:342/443, Having a direction indicator342/419, Portable342/446, Unequal distance between at least three antennas342/457, Land vehicle location (e.g., bus, police car342/458DistanceExaminersPrimary: Wilbur, Maynard R.Assistant: Blum, T. M. Attorney, Agent or FirmAbstractA display system is disclosed for use in connection with a beacon tracking receiver. The display system provides both audible and visual displays for use in locating a source of radio transmission. The display includes an audible tone signal to indicate the reception of a desired signal and with a frequency indicative of the distance to the transmitter. The visual display includes the direction as well as the distance to the transmitter. Also disclosed is a new switching means for use in activating the transmitter of a beacon tracking system. | |
