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For the Inventor, By the Inventor

Oyama, Japan

Sadao Nunotani

This inventor holds 22 USPTO granted patents. Top assignees: Komatsu Corporation, Kabushiki Kaisha Komatsu Seisakusho. Active years: 1979-2006.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Sadao Nunotani. Retrieved from https://idiyas.com/inventor/sadao-nunotani

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 22

% Patents Active = 90.9

Average Co-Inventor Count = 3.5

ph-index = 8

Forward Citations = 146(Granted Patents)


Location History:

  • Kawasaki, JP (1991 - 1992)
  • Kanagawa, JP (1979 - 1993)
  • Hiratsuka, JP (1987 - 1993)
  • Tochigi, JP (1998 - 1999)
  • Tochigi-ken, JP (1999 - 2000)
  • Oyama, JP (1999 - 2006)

Company Filing History:

goldMedal13 out of 2,813 
 
Komatsu Corporation
 patents
silverMedal9 out of 1,009 
 
Kabushiki Kaisha Komatsu Seisakusho
 patents

Years Active: 1979-2006

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22 patents (USPTO):Explore Patents
1. 7124577 - Vehicular steering control device (2006-10-24),
2. 6578296 - Hydraulically driven type working machine (2003-06-17),
3. 6481333 - Positioning device, capacity controller using positioning device, and speed changing device (2002-11-19),
4. 6324959 - Piston pump motor (2001-12-04),
5. 6226987 - Travel drive apparatus for hydraulic drive work vehicles and control therefor (2001-05-08),
6. 6209675 - Travel drive apparatus for hydraulic drive work vehicle and control method therefor (2001-04-03),
7. 6112521 - Backpressure control circuit for hydraulic drive device (2000-09-05),
8. 6068013 - Counter balance valve (2000-05-30),
9. 5946910 - Hydraulic circuit for hydraulically driven working vehicle (1999-09-07),
10. 5930997 - Driving device for a hydraulic motor (1999-08-03),
11. 5907952 - Capacity control device for a hydraulic motor for a hydraulically driven (1999-06-01),
12. 5884984 - Hydraulic braking apparatus having two safety valves (1999-03-23),
13. 5826488 - Swash plate angle changing apparatus for a piston pump/motor of swash (1998-10-27),
14. 5255705 - Hydraulic pressure control system (1993-10-26),
15. 5253672 - Hydraulic pressure control system (1993-10-19),

Title: Sadao Nunotani: Pioneering Innovations in Hydraulic Control Systems

Introduction: Sadao Nunotani, an accomplished inventor based in Oyama, Japan, has made significant contributions to the field of hydraulic control systems. With a remarkable portfolio of 22 patents, Nunotani's inventive spirit has driven innovations that enhance efficiency and functionality in vehicular and working machine technologies.

Latest Patents: Among his most recent patents is a **vehicular steering control device** designed to reduce energy loss while improving the responsiveness of steering systems. This inventive mechanism allows for rapid adjustments in the aperture area of a steering flow control valve, precisely managing differential pressure to ensure that hydraulic oil is supplied efficiently to the steering hydraulic cylinder.

Additionally, Nunotani has developed a **hydraulically driven type working machine** that features a unique hydraulic pipe arrangement. This innovation minimizes contact with obstacles while preventing torsion and bending, thereby optimizing the performance of machinery equipped with hydraulic systems. The design integrates key components like a boom driving hydraulic cylinder and a swivel joint mechanism, allowing for smooth operations in various working conditions.

Career Highlights: Sadao Nunotani's career includes significant stints at well-known companies like Komatsu Corporation, recognized for its advanced machinery and technology. His work at Kabushiki Kaisha Komatsu Seisakusho further solidified his reputation as a leading innovator in the hydraulic systems domain, where he contributed extensively to developing practical engineering solutions.

Collaborations: Throughout his career, Nunotani has collaborated with esteemed colleagues such as Seita Hayashi and Naoki Ishizaki. These partnerships have fostered an environment of innovation and creativity, enabling the development of cutting-edge technologies that have greatly impacted the industry.

Conclusion: Sadao Nunotani's inventive contributions reflect his dedication to advancing hydraulic technologies. With 22 patents to his name and a career marked by significant achievements and collaborations, he continues to be a driving force in the evolution of hydraulic control systems, ensuring optimized performance in various applications. His work not only demonstrates his technical prowess but also his commitment to pushing the boundaries of innovation in engineering.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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