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For the Inventor, By the Inventor

Tokyo, Japan

Motohisa Hirao

This inventor holds 9 USPTO granted patents. Top assignee: Hitachi, Ltd.. Active years: 1981-1994.

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

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

USPTO Granted Patents = 9

% Patents Active = 100.0

Average Co-Inventor Count = 5.9

ph-index = 7

Forward Citations = 146(Granted Patents)


Location History:

  • Suginami, JP (1987 - 1988)
  • Tokyo, JP (1981 - 1994)

Company Filing History:

goldMedal9 out of 42,740 
 
Hitachi, Ltd.
 patents

Years Active: 1981-1994

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9 patents (USPTO):Explore Patents
1. 5340637 - Optical device diffraction gratings and a photomask for use in the same (1994-08-23),
2. 4905057 - Semiconductor devices (1990-02-27),
3. 4841536 - Semiconductor laser devices (1989-06-20),
4. 4775980 - Distributed-feedback semiconductor laser device (1988-10-04),
5. 4665528 - Distributed-feedback semiconductor laser device (1987-05-12),
6. 4426700 - Semiconductor laser device (1984-01-17),
7. 4366569 - Semiconductor laser device including an arrangement for preventing laser (1982-12-28),
8. 4361887 - Semiconductor light emitting element (1982-11-30),
9. 4288757 - Semiconductor laser device (1981-09-08),

Title: Unveiling the Innovations of Inventor Motohisa Hirao from Tokyo

Introduction: Motohisa Hirao, a brilliant inventor based in Tokyo, Japan, has made significant contributions to the field of technology. With a total of 9 patents to his name, Hirao's inventive spirit and dedication to innovation have propelled him to the forefront of the industry.

Latest Patents: Among his latest patents is an innovative optical device for diffraction gratings and a photomask designed for use in the same. This method allows for the fabrication of diffraction gratings by forming a bright/dark pattern on a photoresist through the interference of transmission light and diffraction light. Additionally, he has patented semiconductor devices that offer improved performance by incorporating specific junctions and energy band widths.

Career Highlights: Motohisa Hirao is a valued member of Hitachi, Ltd., a renowned technology company known for its cutting-edge solutions. His work on semiconductor devices and optical technologies has garnered recognition within the industry and beyond.

Collaborations: Hirao has collaborated with esteemed colleagues such as Shinji Tsuji and Michiharu Nakamura. Their combined expertise has led to the development of groundbreaking inventions that push the boundaries of what is possible in the world of technology.

Conclusion: In conclusion, Motohisa Hirao's innovative spirit and commitment to excellence have solidified his reputation as a leading inventor in the field of technology. His patents and contributions continue to inspire future generations of inventors and researchers, shaping the landscape of innovation for years to come.

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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