William J Marshall, Jr

Title: Innovations of William J Marshall, Jr.

Introduction

William J Marshall, Jr. is a notable inventor based in Nashua, NH (US). He has made significant contributions to the field of underwater transducers, holding a total of 2 patents. His work focuses on enhancing the functionality and durability of transducer technology.

Latest Patents

One of his latest inventions is the "Wall-driven oval ring transducer." This invention is a small lightweight underwater transducer that operates at low frequencies. The design incorporates piezoelectric material embedded in the wall of an oval shell between the shell's nodal points. When an alternating voltage is applied, the piezoelectric material expands and contracts, causing large circumferential strains in the shell. This results in the shell vibrating and radiating energy into the water. Additionally, this invention can also function as a receiving type of transducer.

Another significant patent is the "Stress relief for flextensional transducer." This device allows a flextensional transducer to operate even after experiencing high pressure, equal to or greater than the survival depth of previous designs. The innovation is achieved by not bonding at least one end of the transducer's piezoelectric stack to the shell, allowing the shell to move away from the stack under pressure. This design prevents tensile stress on the piezoelectric stack, ensuring it does not fracture. When the pressure is less than the survival depth, the shell recontacts the free end of the stack, allowing the transducer to function effectively.

Career Highlights

William J Marshall, Jr. is associated with Sanders Associates Limited, where he has contributed to various innovative projects. His work has significantly advanced the field of underwater acoustics and transducer technology.

Collaborations

He has collaborated with notable coworkers such as Gerald A Brigham and Ronald P White, further enhancing the innovative capabilities of his team.

Conclusion

William J Marshall, Jr. is a distinguished inventor whose contributions to underwater transducer technology have made a lasting impact. His innovative patents demonstrate his commitment to advancing the field and improving the functionality of transducers.