Broadband phased array transducer design with frequency controlled two dimension capability and methods for manufacture thereof
Patent 5438998 Issued on August 8, 1995. Estimated Expiration Date: 
September 7, 2013. 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.
September 7, 2013. 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 2486916 3028752 3694677 3833825 Linear array ultrasonic transducer Wide-band ultrasonic transducer and its uses Ultrasonic beam forming technique Ultrasonic imaging system Coupling for a focused ultrasonic transducer Ultrasonic transducer and examination method InventorApplicationNo. 117869 filed on 09/07/1993US Classes:600/459, Structure of transducer or probe assembly310/334Acoustic wave type generator or receiverExaminersPrimary: Jaworski, Francis J.Attorney, Agent or FirmForeign Patent References
International ClassA61B 008/00AbstractThere is provided a transducer array with a plurality of piezoelectric elements having a minimum and maximum thickness. In one embodiment, the maximum thickness is less than or equal to 140 percent of the minimum thickness. In an alternate embodiment, the maximum thickness is greater than 140 percent of the minimum thickness and the transducer array is capable of simulating the excitation of a wider aperture two-dimensional transducer array. One or more matching layers may be used to further increase bandwidth performance. In addition, a two crystal transducer element as well as a composite transducer structure may be formed using the principles of this invention.Other References
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