Sonar apparatus
Patent 4833659 Issued on May 23, 1989. Estimated Expiration Date: 
May 23, 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.
May 23, 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 ReferencesInventors
AssigneeApplicationNo. 06/686804 filed on 12/27/1984US Classes:367/155, Piezoelectric310/326, Combined with damping structure310/332, Multimorph310/800, PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)367/165Specific support structureExaminersPrimary: Cangialosi, SalvatoreAttorney, Agent or FirmInternational ClassesH01L 41/113 (20060101)B06B 1/06 (20060101) AbstractA hydrophone array wherein each individual hydrophone of the array is comprised of, e.g. polyvinylidine fluoride (PVF2), tiles bonded to a substrate member opposite one another on opposite surfaces of the substrate. The substrate is a relatively stiff, metallic member having a Young's modulus of at least an order of magnitude greater than the PVF2 tiles which are oriented such that their stretch directions on either side of the substrate are parallel to one another. The directions of polarization of the tiles are either the same or opposite and electrical connections are made such that for a predetermined relative orientation of the directions of polarization, any output signal which may be caused by flexing or acceleration of the substrate is substantially reduced or eliminated. | |
