Location History:
- Juo-machi, JP (1999)
- Ibaraki-ken, JP (1999)
- Jyuou-machi, JP (2000)
- Chiyoda-ku, JP (2009)
- Hitachi, JP (1995 - 2013)
Company Filing History:
11 out of 42,485 
3 out of 1,498 
1 out of 162 Years Active: 1995-2013
Title: Keizo Shimada: Innovator in Electric Drive Vehicles
Introduction: Keizo Shimada is a prominent inventor based in Hitachi, Japan, known for his significant contributions to the field of electric drive vehicles. With a total of 12 patents to his name, Shimada has been instrumental in advancing technology that enhances vehicle performance and efficiency.
Latest Patents: Among his latest innovations, Shimada has developed an electric drive vehicle featuring an induction motor for braking or driving wheels. This vehicle includes a motor controller that regulates the induction motor and mechanical brakes for effective stopping. Notably, while the vehicle is stationary, the motor controller applies DC or AC voltage within a frequency range of -1 Hz to +1 Hz to generate torque, ensuring the vehicle remains halted. Another of his recent patents involves an electric drive vehicle equipped with a power generator linked to an engine, along with a series of power converters that manage the conversion of AC to DC power and vice versa. This design allows for dual control modes, optimizing both the electric motor's output and the power consumption of connected devices.
Career Highlights: Keizo Shimada has had a distinguished career, working with notable companies such as Hitachi, Ltd. and Hitachi Construction Machinery Co., Ltd. His work has significantly impacted the development of electric vehicles, making them more efficient and reliable.
Collaborations: Throughout his career, Shimada has collaborated with
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.