This inventor holds 4 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Engineering Ltd, Tokyo Electric Co.. Active years: 1984-1993.
Company Filing History:
4 out of 42,713 
1 out of 7 
1 out of 492 Years Active: 1984-1993
Title: Sadao Yanada: Innovator in Servo Valve Control Systems
Introduction
Sadao Yanada is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of control systems, particularly in the development of servo valve control apparatuses. With a total of 4 patents, Yanada's work has had a profound impact on process control technologies.
Latest Patents
One of Yanada's latest patents is the "Servo valve control apparatus." This invention provides a method and apparatus for controlling a triple-coil servo valve arranged in a tripled control system. Each control system consists of components such as a coil, a servo amplifier, and a controller. The invention includes means for identifying abnormalities in each component, separating servo amplifier outputs, and combining components effectively. This innovation allows for the continued operation of a plant even when two control systems are faulty, thus preventing disturbances in operations.
Another significant patent is the "Process control system and method thereof." This system features a timer circuit that establishes operational periods by issuing instructions for starting multiple time periods. A periodic operation selection circuit selects control blocks for computation within each time period based on instructions from the timer circuit. This method ensures that control blocks are executed consecutively, even if computations are not completed within predetermined time frames.
Career Highlights
Sadao Yanada has worked with prominent companies such as Hitachi, Ltd. and Tokyo Electric Co. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the field of control systems.
Collaborations
Throughout his career, Yanada has collaborated with notable coworkers, including Takumi Kawai and Tadahiko Iijima. These partnerships have fostered an environment of innovation and creativity, leading to advancements in technology.
Conclusion
Sadao Yanada's contributions to servo valve control systems and process control technologies highlight his role as a significant inventor in the field. His patents reflect a commitment to enhancing operational efficiency and reliability in industrial applications.