Underwater guidance system
Patent 5077703 Issued on December 31, 1991. Estimated Expiration Date: 
January 8, 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.
January 8, 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 2962697 3587038 InventorApplicationNo. 638773 filed on 01/08/1991US Classes:367/118, DISTANCE OR DIRECTION FINDING367/910PORTABLE SONAR DEVICESExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassG01S 003/80AbstractAn underwater guidance system includes a transmitter located at a home base and generating a signal having a prescribed frequency. A diver wears a receiver on his wrist. The receiver includes a plurality of direction indicating elements and an out-of-range indicating element. The diver views the receiver to determine his position relative to the transmitter. | |
