Location History:
- Hitachi, JA (1976 - 1978)
- Ibaraki, JP (1980 - 1981)
- Hitachi, JP (1979 - 2007)
Company Filing History:
24 out of 42,517 
6 out of 152 
3 out of 1,430 
Years Active: 1976-2007
Title: The Innovative Mind of Katsuji Marumoto
Introduction
Katsuji Marumoto, an esteemed inventor based in Hitachi, Japan, has made significant contributions to the field of automotive engineering. With an impressive portfolio of 28 patents, his work focuses primarily on enhancing the functionality and efficiency of motor-driven throttle valves. Marumoto's innovative approaches not only improve vehicle performance but also ensure safety and reliability in automotive systems.
Latest Patents
Marumoto's latest patents highlight his dedication to advancing automotive technologies. Notable among these are:
1. **Method and apparatus for controlling motor-driven throttle valve**
2. **Automobile**
3. **Method of measuring temperature of motor for driving automotive throttle valve**
4. **Method of measuring motor temperature**
These patents introduce a method aimed at avoiding undesirable effects on various physical values caused by temperature changes in the motor driving a throttle valve. He has developed a technique for measuring motor temperature electrically, utilizing a compensation device that corrects the power supply by detecting the impedance of the motor windings. This innovative method estimates the motor's temperature from the current and voltage supplied, ultimately preventing secondary problems.
Career Highlights
Marumoto has had a distinguished career, having worked with prominent companies such as Hitachi, Ltd. and Hitachi Automotive Engineering Co., Ltd. His role in these organizations has allowed him to apply his inventive skills to real-world challenges, resulting in meaningful advancements in automotive technology.
Collaborations
Throughout his career, Marumoto has collaborated with notable coworkers, including Tsutomu Omae and Masatoshi Hoshino. These partnerships have fostered a creative environment for innovation and have contributed to the successful development of multiple patents that reflect their collective expertise.
Conclusion
Katsuji Marumoto stands out in the sphere of automotive innovation through his extensive patent portfolio and collaboration with fellow experts. His inventions not only enhance the functionality of motor-driven throttle valves but also present a modern approach to automotive engineering challenges. Marumoto's commitment to innovation continues to pave the way for advancements in the automotive industry.