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.

USPTO Granted Patents = 63 (Patent Applications = 4)

% Patents Active = 82.5

EPO Patents = 1

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:

Fujitsu Optical Components Limited

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):Sort by Forward CitationsExplore 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.