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For the Inventor, By the Inventor

Mito, Japan

Masahiro Yanagisawa

This inventor holds 67 USPTO granted patents and 3 published patent applications and 15 EPO patents, primarily in Optical Devices (CPC class 4286). Top assignees: Nec Corporation, Nippon Telegraph and Telephone Corporation, Ricoh Company, Ltd.. Active years: 1978-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masahiro Yanagisawa. Retrieved from https://idiyas.com/inventor/masahiro-yanagisawa

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

USPTO Granted Patents = 67 

% Patents Active = 94.0

 

Average Co-Inventor Count = 1.7

ph-index = 16

Forward Citations = 754(Granted Patents)

Forward Citations (Not Self Cited) = 718(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JA (1978)
  • Ibaraki, JP (1999)
  • Higashiakatsuka, Mito-shi, Ibaraki, JP (2000)
  • Kanagawa-ken, JP (2003 - 2005)
  • Isehara, JP (2008)
  • Mito, JP (1997 - 2013)
  • Tokyo, JP (1979 - 2014)
  • Okayama, JP (2004 - 2014)
  • Atsugi, JP (2014)
  • Kanagawa, JP (2011 - 2020)
  • Yokohama, JP (2015 - 2022)

Company Filing History:

goldMedal24 out of 36,718 
 
Nec Corporation
 patents
silverMedal16 out of 5,300 
 
Nippon Telegraph and Telephone Corporation
 patents
bronzeMedal12 out of 28,951 
 
Ricoh Company, Ltd.
 patents
4. 8 out of 1,038 
 
Nippon Electric Co., Ltd.
 patents
5. 6 out of 164 
 
Ntt Electronics Corporation
 patents
6. 2 out of 8,267 
 
Tdk Corporation
 patents
7. 1 out of 836 
 
Hitachi Cable, Inc.
 patents
8. 1 out of 42,740 
 
Hitachi, Ltd.
 patents
9. 1 out of 11 
 
Takeuchi Industrial Co., Ltd.
 patents
10. 1 out of 141 
 
Tokyo University of Science Foundation
 patents
11. 1 out of 164 
 
Waseda University
 patents
12. 1 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1978-2025

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Areas of Expertise:
Optical Device
Waveguide
Electrochromic Display
Image Display
Optical Module
Electrophoretic Device
Colorant
Multicast Switch
Magnetic Disk
Fine Particles
Dispersion Liquid
67 patents (USPTO):Explore Patents
1. 12306533 - Optical device manufacturing method and manufacturing apparatus using local etching (2025-05-20),
2. 11287578 - Multicast switch (2022-03-29),
3. 10703911 - Organic colorant, coloring composition, and inkjet ink (2020-07-07),
4. 10126502 - Optical waveguide device and module (2018-11-13),
5. 10100138 - Dispersant and method for producing same, ink, and method for forming electro-conductive pattern (2018-10-16),
6. 9684129 - Optical waveguide device and module (2017-06-20),
7. 9020307 - Optical waveguide device and module (2015-04-28),
8. 8900524 - Optical sensor (2014-12-02),
9. 8736941 - Electrochromic display apparatus and method of manufacturing the same (2014-05-27),
10. 8728620 - Fine particles and method of producing thereof, fine particle dispersion liquid, and image display medium and image display apparatus (2014-05-20),
11. 8625943 - Waveguide device and module (2014-01-07),
12. 8554040 - Planar lightwave circuit, design method for wave propagation circuit, and computer program (2013-10-08),
13. 8538222 - Planar lightwave circuit, design method for wave propagation circuit, and computer program (2013-09-17),
14. 8463097 - Planar lightwave circuit, design method for wave propagation circuit, and computer program (2013-06-11),
15. 8441713 - Electrophoretic liquid and display device using electrophoretic liquid (2013-05-14),

Title: The Innovative Mind of Masahiro Yanagisawa

Introduction: Masahiro Yanagisawa, based in Mito, Japan, is an esteemed inventor known for his remarkable contributions to the field of optical technology. With a staggering total of 54 patents to his name, Yanagisawa continues to push the boundaries of innovation and practical application.

Latest Patents: Among his latest innovations are the Multicast Switch and an Optical Waveguide Device and Module. The Multicast Switch is a compact design that reduces the number of leads by half compared to conventional configurations. This inventive switch comprises multiple input and output ports facilitated by M x N optical switch units, which allows for seamless optical signal transmission. The Optical Waveguide Device features a termination structure filled with a light-blocking material, effectively reducing crosstalk and ensuring optimal performance in optical devices integrated within the same substrate.

Career Highlights: Yanagisawa has had an illustrious career, having worked with prominent companies such as NEC Corporation and Nippon Telegraph and Telephone Corporation. His technical expertise and innovative mindset have helped pave the way for advancements in optical technologies.

Collaborations: Yanagisawa has collaborated with notable professionals in the field, including Toshikazu Hashimoto and Yasufumi Yamada. Their combined efforts have contributed to the successful development of various groundbreaking inventions.

Conclusion: Masahiro Yanagisawa's impressive portfolio of patents and collaborations exemplifies the spirit of innovation and dedication to technological advancement. His work continues to influence the optical technology landscape, leaving a lasting legacy that inspires future inventors and researchers.

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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