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For the Inventor, By the Inventor

Ibaraki, Japan

Haruo Watanabe

This inventor holds 12 USPTO granted patents. Top assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.. Active years: 1983-1994.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Haruo Watanabe. Retrieved from https://idiyas.com/inventor/haruo-watanabe-q925eiv7

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

USPTO Granted Patents = 12

% Patents Active = 100.0

Average Co-Inventor Count = 4.6

ph-index = 7

Forward Citations = 151(Granted Patents)


Location History:

  • Hitachi, JP (1983 - 1984)
  • Tsuchiura, JP (1992)
  • Ibaraki, JP (1984 - 1993)
  • Chiyoda, JP (1994)

Company Filing History:

goldMedal12 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal3 out of 152 
 
Hitachi Automotive Engineering Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1983-1994

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12 patents (USPTO):Explore Patents
1. 5285027 - Hydraulic elevator and a control method thereof (1994-02-08),
2. 5265701 - Elevator with means for controlling upward and downward movement of cage (1993-11-30),
3. 5108037 - Fuel injection valve (1992-04-28),
4. 5098016 - Electromagnetic fuel injection valve (1992-03-24),
5. 5018501 - Electromagnetic fuel injection valve apparatus (1991-05-28),
6. 4995559 - Electromagnetic fuel injection valve (1991-02-26),
7. 4887769 - Electromagnetic fuel injection valve (1989-12-19),
8. 4544129 - Direct-acting servo valve (1985-10-01),
9. 4529362 - Servo pump for hydraulic systems (1985-07-16),
10. 4464978 - Servovalve apparatus (1984-08-14),
11. 4428559 - Direct drive type servo valve (1984-01-31),
12. 4404892 - Hydraulic operating apparatus (1983-09-20),

Title: Haruo Watanabe: Innovator in Hydraulic Elevator Technology

Introduction

Haruo Watanabe is a prominent inventor based in Ibaraki, Japan, known for his significant contributions to hydraulic elevator technology. With a total of 12 patents to his name, Watanabe has developed innovative solutions that enhance the efficiency and safety of elevator systems.

Latest Patents

Watanabe's latest patents include a hydraulic elevator and a control method thereof. This hydraulic elevator features a car, a hydraulic jack, a hydraulic pump, and control means for regulating the flow rate of fluid to and from the hydraulic jack, thereby controlling the car's movement. The control means includes a main valve that allows fluid flow from the pump into the hydraulic jack when the fluid pressure exceeds a predetermined value, facilitating the car's upward movement. Additionally, it checks fluid flow from the hydraulic jack when the pressure is below this value. The valve control means consists of multiple pilot valves that manage the main valve's opening and closing operations, allowing for versatile control patterns.

Another notable patent is an elevator with a mechanism for controlling the upward and downward movement of the cage. In this design, a shoe is brought into and out of contact with a drum or disk of a brake using a combination of a spring and a hydraulic cylinder. The braking force is optimized based on the cage's inertial mass and speed, with fluid pressure controlling the shoe's pressing force against the drum or disk. This system ensures that the brake operates effectively, even during power failures, by utilizing an emergency power source.

Career Highlights

Throughout his career, Haruo Watanabe has worked with esteemed companies such as Hitachi, Ltd. and Hitachi Automotive Engineering Co., Ltd. His experience in these organizations has contributed to his expertise in hydraulic systems and elevator technology.

Collaborations

Watanabe has collaborated with notable coworkers, including Ken Ichiryu and Yoshio Okamoto, further enriching his innovative endeavors.

Conclusion

Haruo Watanabe's contributions to hydraulic elevator technology have made a significant impact on the industry. His innovative patents and career achievements reflect his dedication to enhancing safety and efficiency in elevator systems.

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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