Position and velocity measuring system
Patent 5008860 Issued on April 16, 1991. Estimated Expiration Date: 
March 16, 2009. 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.
March 16, 2009. 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 ReferencesHigh resolution acoustic navigation system Precision transponder and method of communicating therewith Patent #: 4214314 InventorsAssigneeApplicationNo. 336452 filed on 03/16/1989US Classes:367/6With plurality of transpondersExaminersPrimary: Pihulic, Daniel T.Attorney, Agent or FirmInternational ClassH04B 001/59AbstractA position and velocity determining system, that uses two functioned receiver-transmitters. In performing a first function, each receiver-transmitter transmits an acoustic pulse at a unique frequency, in response to a first received accoustic pulse. In performing a second function, each receiver-transmitter transmits a continuous acoustic signal at a unique frequency, in response to a second received acoustic pulse. | |
