This inventor holds 18 USPTO granted patents, primarily in Hydraulic Transmission Control. Top assignees: Honda Giken Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Kogyo Kabushiki Kaisha. Active years: 1990-1999.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Location History:
- Kamifukuoka, JP (1990 - 1996)
- Saitama-ken, JP (1997)
- Wako, JP (1997 - 1998)
- Saitama, JP (1993 - 1999)
Company Filing History:
17 out of 10,092 
1 out of 1,650 
Years Active: 1990-1999
Areas of Expertise:
Title: The Innovative Contributions of Tsunefumi Niiyama
Introduction
Tsunefumi Niiyama is a prominent inventor based in Saitama, Japan. He has made significant contributions to the field of automotive technology, particularly in hydraulic control systems for vehicle transmissions. With a total of 18 patents to his name, Niiyama's work has had a lasting impact on the industry.
Latest Patents
One of Niiyama's latest patents is a hydraulic control apparatus for a continuously variable transmission. This innovative apparatus can produce stable drive pulley pressure and driven pulley pressure while controlling the speed change time. The line pressure regulated by the regulator valve is supplied to the control valves of both the drive and driven pulleys. These control valves adjust the line pressure based on the output from solenoid valves, allowing for precise gear ratio maintenance and adjustments.
Another notable patent is an oil pressure control system for automatic vehicle transmissions. This system manages the oil pressure of various frictional engaging elements within the transmission. It includes solenoid valves that supply pressurized oil to these elements and features a manual valve that allows for operation even in the event of solenoid valve failure. The underdrive engage control valve further regulates the pressure of the oil supplied to the frictional engaging elements, ensuring optimal performance.
Career Highlights
Throughout his career, Tsunefumi Niiyama has worked with leading automotive companies, including Honda and Mitsubishi. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in vehicle transmission technology.
Collaborations
Niiyama has collaborated with notable individuals in the industry, including Yukio Morita and Takashi Hotta. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies.
Conclusion
Tsunefumi Niiyama's contributions to automotive technology through his patents and collaborations have significantly advanced the field of vehicle transmissions. His innovative spirit continues to inspire future developments in the industry.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile