Company Filing History:

10 out of 1,009

Kabushiki Kaisha Komatsu Seisakusho

patents

1 out of 2,736

Komatsu Corporation

patents

1 out of 832,891

Other

patents

Years Active: 1979-1997

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12 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 5697764 - Displacement control system for variable displacement hydraulic pump (1997-12-16),

2. 5477678 - Hydraulic circuit system (1995-12-26),

3. 5398507 - Hydraulic circuit system (1995-03-21),

4. 5279122 - Hydraulic circuit apparatus for supplying fluid under pressure into (1994-01-18),

5. 5273069 - Operation valve with pressure compensation valve (1993-12-28),

6. 5271227 - Hydraulic apparatus with pressure compensating valves (1993-12-21),

7. 5218897 - Hydraulic circuit apparatus for operating work-implement actuating (1993-06-15),

8. 5212950 - Hydraulic circuit with pilot pressure controlled bypass (1993-05-25),

9. 5209063 - Hydraulic circuit utilizing a compensator pressure selecting value (1993-05-11),

10. 5188147 - Pressure compensating type hydraulic valve (1993-02-23),

11. 4473090 - Hydraulic power system for implement actuators in an off-highway (1984-09-25),

12. 4167197 - Directional change-over valve (1979-09-11),

Title: Kiyoshi Shirai: Innovator in Hydraulic Systems

Introduction

Kiyoshi Shirai is a prominent inventor based in Kawasaki, Japan. He has made significant contributions to the field of hydraulic systems, holding a total of 12 patents. His innovative designs have improved the efficiency and functionality of hydraulic circuits.

Latest Patents

One of Kiyoshi Shirai's latest patents is a displacement control system for variable displacement hydraulic pumps. This hydraulic circuit system is designed to optimize the flow of pressurized oil supplied to multiple actuators. In this system, heavily-loaded actuators receive pressurized oil at gradually reducing flow rates to minimize shock, while lightly-loaded actuators are supplied with oil at gradually increasing flow rates to enhance their working speeds. The system includes several directional control valves equipped with pressure-compensated flow control valves, which feature load lead-in passages with restriction means. Additionally, relief valves are incorporated to relieve pressurized oil under the influence of load pressure from the actuators, ensuring smooth operation.

Career Highlights

Throughout his career, Kiyoshi Shirai has worked with notable companies such as Komatsu Seisakusho and Komatsu Corporation. His experience in these organizations has allowed him to develop and refine his innovative hydraulic technologies.

Collaborations

Kiyoshi has collaborated with talented individuals in his field, including Naoki Ishizaki and Teruo Akiyama. These collaborations have contributed to the advancement of hydraulic system technologies.

Conclusion

Kiyoshi Shirai's contributions to hydraulic systems through his patents and collaborations highlight his role as an influential inventor in the industry. His work continues to impact the efficiency of hydraulic applications, showcasing the importance of innovation in engineering.

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