Sonic positioning device
Patent 4862152 Issued on August 29, 1989. Estimated Expiration Date: 
August 29, 2006. 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.
August 29, 2006. 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 3504334 3792243 3838212 Position-determining system Ultrasonic position detecting system Control interface Graphical data apparatus Wireless cursor control system Patent #: 4654648 InventorApplicationNo. 06/694765 filed on 01/25/1985US Classes:345/158, Including orientation sensors (e.g., infrared, ultrasonic, remotely controlled)178/18.04, Acoustical (e.g., vibration, ultrasonic, etc.)367/104, By transducer movement367/117, PLURAL TRANSMITTERS TO RECEIVER OR TRANSMITTER TO PLURAL RECEIVERS367/907, COORDINATE DETERMINATION901/1MOBILE ROBOTExaminersPrimary: Caldwell, Sr., John W.Assistant: Queen, Tyrone Attorney, Agent or FirmInternational ClassG06F 3/033 (20060101)AbstractA three-dimensional ultrasonic position control device suitable for controlling computer displays or robot movements is disclosed.More specifically, signals from an ultrasonic transmitter are received by multiple receivers. The received signals are processed by a processing circuit which provides signals to a computer system for use in controlling a computer display or a robot. This system is particularly adapted to use inexpensive components to provide for a low cost mass producible control device.Other References
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