Osaka, Japan

Keiji Hirao

This inventor holds 34 USPTO granted patents and 2 published patent applications, primarily in Fluid Control Devices. Top assignees: Fujikin Inc., Sanyo Electric Co., Ltd., Tadahiro Ohmi. Active years: 1997-2023.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiji Hirao. Retrieved from https://idiyas.com/inventor/keiji-hirao

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

USPTO Granted Patents = 34 

% Patents Active = 76.5

Average Co-Inventor Count = 5.8

ph-index = 11

Forward Citations = 470(Granted Patents)


Location History:

  • Moriguchi, JP (1997 - 1999)
  • Osaka, JP (1998 - 2023)

Company Filing History:


Years Active: 1997-2023

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Areas of Expertise:
Concentration Measurement
Fluid Control
Vaporization
Moisture Generation
Exhaust Gas Treatment
Couplings
Heating Devices
Optical Disk Control
Playback Devices
Command Processing
34 patents (USPTO):Explore Patents

Title: Keiji Hirao: Innovator in Concentration Measurement and Fluid Control Technologies

Introduction

Keiji Hirao is a prominent inventor based in Osaka, Japan, with a remarkable portfolio of 34 patents to his name. His contributions to the fields of concentration measurement and fluid control technologies have significantly impacted various industries, demonstrating his ingenuity and commitment to innovation.

Latest Patents

Hirao's latest inventions include a concentration measurement device and a fluid control device. The concentration measurement device comprises a measurement cell featuring a flow path, a light source, and a photodetector for detecting light emitted from the measurement cell. This innovative device calculates light absorbance and the concentration of a fluid based on the output from the photodetector. The cell design includes a body, a window portion that contacts the flow path, and a reflective member to enhance measurement accuracy.

The fluid control device is engineered to manage the temperatures of fluid heating sections maintained at different temperatures. It consists of multiple interconnected fluid heating sections, each featuring a flow path or accommodating portion. Equipped with heaters, this device ensures that every fluid heating section operates at its designated temperature, aided by heat insulating members that are strategically placed between adjacent sections.

Career Highlights

Hirao has had an impressive career, notably working with Fujikin Inc., where he developed groundbreaking technologies that propelled the company's innovation framework. His work with Fujikin highlights his ability to blend theoretical knowledge with practical applications in fluid dynamics and measurement sciences.

Collaborations

Throughout his career, Hirao has collaborated with notable colleagues, such as Nobukazu Ikeda and Yukio Minami. These partnerships have facilitated the cross-pollination of ideas and advancements within their respective fields, further enhancing the innovation landscape in which they operate.

Conclusion

Keiji Hirao stands out as an influential inventor whose work in concentration measurement and fluid control devices has garnered recognition in the innovation community. With a growing portfolio of patents and a dedication to enhancing technological solutions, Hirao continues to be a significant contributor to advancements in his field. His journey exemplifies the spirit of innovation and the impact of collaborative efforts in driving forward the boundaries of what is possible.

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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