Location History:
- Dayton, OH (US) (1984 - 1986)
- Seal Beach, CA (US) (1987 - 2020)
- Pasadena, CA (US) (2019 - 2023)
Company Filing History:
27 out of 4,548 
4 out of 25 
3 out of 2,449 
Years Active: 1984-2023
Title: Innovations and Patents of Yoseph Bar-Cohen
Introduction
Yoseph Bar-Cohen is a renowned inventor based in Seal Beach, California, who has made significant contributions to the field of ultrasonic technology. With a remarkable portfolio of 43 patents, he is known for his innovative designs that enhance the functionality of various ultrasonic actuators.
Latest Patents
Among his latest inventions, Bar-Cohen has developed the "Dual frequency ultrasonic and sonic actuator with constrained impact mass." This actuator uniquely constrains the displacement of the impact mass using several methods, including a cavity that applies ultrasonic stress, a spring attached to the horn's tip, and a flexure. This innovative design converts ultrasonic stress into lower frequency sonic stress, which can then be transmitted through various surfaces using specialized transmitting elements such as a longitudinal probe, drill bit, or thumper.
Another notable patent is the "Multi-stack piezo actuator," where Bar-Cohen presents an ultrasonic actuator featuring an increased radiating surface. This is achieved through multiple piezoelectric stacks compressed by bolts against a common backing structure. The design includes tuning grooves and/or slots to ensure amplitude uniformity, while the symmetrical shape of the radiating surface contributes to its efficiency.
Career Highlights
Throughout his career, Bar-Cohen has worked with prestigious institutions such as the California Institute of Technology, where his research has greatly influenced the advancement of ultrasonic technologies. His work demonstrates a commitment to pioneering solutions that enhance the performance and applicability of ultrasonic devices.
Collaborations
Yoseph Bar-Cohen has collaborated with notable colleagues, including Stewart Sherrit and Xiaoqi Bao. These partnerships have fostered a dynamic exchange of ideas that have led to groundbreaking advancements in the field of ultrasonic innovation.
Conclusion
Yoseph Bar-Cohen's contributions to the realm of ultrasonic technology exemplify his inventive spirit and dedication to innovation. With numerous patents and a history of significant collaborations, he continues to influence the development of advanced ultrasonic applications that hold promise for various industries.