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For the Inventor, By the Inventor

Kawasaki, Japan

Masaharu Doi

This inventor holds 63 USPTO granted patents and 4 published patent applications and 1 EPO patent, primarily in Optical Devices (CPC class G02F). Top assignees: Fujitsu Corporation, Fujitsu Optical Components Limited, Tdk Corporation. Active years: 1993-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masaharu Doi. Retrieved from https://idiyas.com/inventor/masaharu-doi

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

USPTO Granted Patents = 63 

% Patents Active = 82.5


Average Co-Inventor Count = 3.1

ph-index = 10

Forward Citations = 297(Granted Patents)

Forward Citations (Not Self Cited) = 275(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Atsugi, JP (1993)
  • Isehara, JP (2006)
  • Kawasaki, JP (1995 - 2014)
  • Kanagawa, JP (2021)
  • Sapporo, JP (2016 - 2024)

Company Filing History:

goldMedal43 out of 39,378 
 
Fujitsu Corporation
 patents
silverMedal19 out of 250 
 
Fujitsu Optical Components Limited
 patents
bronzeMedal4 out of 8,267 
 
Tdk Corporation
 patents
where one patent can have more than one assignee

Years Active: 1993-2025

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Areas of Expertise:
Optical Device
Optical Communication
Optical Modulator
Electro-Optic Device
Optical Waveguide
Polarization Multiplexing
Optical Transmission
Acousto-Optic Filter
Manufacturing Method
Optical Module
Ferroelectric Substrate
Waveguide Type
63 patents (USPTO):Explore Patents
1. 12197054 - Optical device and optical communication apparatus (2025-01-14),
2. 12044910 - Optical device and optical communication apparatus (2024-07-23),
3. 11693291 - Optical waveguide device and method of manufacturing optical waveguide device (2023-07-04),
4. 11693290 - Optical waveguide device (2023-07-04),
5. 11624965 - Optical waveguide device (2023-04-11),
6. 11086149 - Electro-optic device (2021-08-10),
7. 11003044 - Electro-optic device (2021-05-11),
8. 11003043 - Optical modulator (2021-05-11),
9. 10989980 - Optical modulator (2021-04-27),
10. 10754179 - Optical modulator, optical modulator module, and optical transmitter module (2020-08-25),
11. 10303036 - Optical modulator (2019-05-28),
12. 10295883 - Optical module and optical modulator (2019-05-21),
13. 10268099 - Optical modulator and optical module (2019-04-23),
14. 10175553 - Optical module (2019-01-08),
15. 10095080 - Optical modulator and optical module (2018-10-09),

Title: The Innovative Mind of Masaharu Doi

Introduction: Masaharu Doi is a pioneering inventor hailing from Kawasaki, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Masaharu Doi has recently been granted several patents for his cutting-edge inventions in the realm of electronics and robotics, showcasing his continuous dedication to pushing the boundaries of what is possible in the industry.

Career Highlights: With a career spanning over two decades, Masaharu Doi has established himself as a prominent figure in the world of inventors, with a strong focus on developing solutions that enhance efficiency and functionality in various sectors.

Collaborations: Throughout his career, Masaharu Doi has collaborated with leading research institutions, universities, and tech companies to bring his ideas to life, fostering a culture of innovation and progress in the field.

Conclusion: Masaharu Doi's relentless pursuit of innovation and his passion for creating impactful inventions have solidified his position as a trailblazer in the world of technology, inspiring future generations of inventors to think outside the box and strive for excellence.

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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