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For the Inventor, By the Inventor

Yokohama, Japan

Takaaki Yamaguchi

This inventor holds 78 USPTO granted patents and 6 EPO patents, primarily in Liquid Ejection Technology (CPC class B41J). Top assignees: Canon Kabushiki Kaisha, Mitsubishi Gas Chemical Company, Inc.. Active years: 1980-2024.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takaaki Yamaguchi. Retrieved from https://idiyas.com/inventor/takaaki-yamaguchi

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

USPTO Granted Patents = 78

% Patents Active = 33.3

 

Average Co-Inventor Count = 5.3

ph-index = 10

Forward Citations = 384(Granted Patents)

Forward Citations (Not Self Cited) = 339(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JP (1980 - 1982)
  • Kanagawa, JP (2004 - 2011)
  • Yokohama-shi, JP (2014)
  • Yokohama, JP (2007 - 2020)

Company Filing History:

goldMedal76 out of 92,994 
 
Canon Kabushiki Kaisha
 patents
silverMedal2 out of 2,304 
 
Mitsubishi Gas Chemical Company, Inc.
 patents

Years Active: 1980-2024

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Areas of Expertise:
Liquid Ejection Head
Print Element Substrate
Inkjet Printhead
Printing Apparatus
Liquid Discharge Head
Manufacturing Method
Recording Element Substrate
Semiconductor Device
Head Cartridge
Electrical Connection
Liquid Discharge Cartridge
Element Board
78 patents (USPTO):Explore Patents
1. 12138928 - Method for manufacturing liquid ejection head substrate and method for manufacturing liquid ejection head (2024-11-12),
2. 10632741 - Print element substrate, method of manufacturing print element substrate, and method of manufacturing printhead (2020-04-28),
3. 10603912 - Element board, liquid ejection head, and printing apparatus (2020-03-31),
4. 10500851 - Print element substrate, printhead, and printing apparatus (2019-12-10),
5. 10322578 - Liquid ejection head and liquid ejection apparatus (2019-06-18),
6. 10150295 - Liquid ejection head and method for manufacturing the same (2018-12-11),
7. 9950525 - Element substrate for liquid ejecting head and wafer (2018-04-24),
8. 9919518 - Printing element substrate, liquid ejection head, and printing apparatus (2018-03-20),
9. 9833992 - Recording-element substrate, recording head, and recording apparatus (2017-12-05),
10. 9694575 - Semiconductor device, liquid discharge head, liquid discharge cartridge, and liquid discharge apparatus (2017-07-04),
11. 9555629 - Liquid discharge substrate, liquid discharge head, and printing apparatus (2017-01-31),
12. 9522529 - Substrate for liquid ejection head, liquid ejection head, and apparatus and method for ejecting liquid (2016-12-20),
13. 9340022 - Liquid discharging substrate, printhead, and printing apparatus (2016-05-17),
14. 9242460 - Liquid-discharge-head substrate, method of manufacturing the same, and liquid discharge head (2016-01-26),
15. 8876242 - Liquid ejection head (2014-11-04),

Title: Takaaki Yamaguchi: Innovator in Liquid Ejection Technology

Introduction

Takaaki Yamaguchi is a prominent inventor based in Yokohama, Japan, known for his significant contributions to liquid ejection technology. With a remarkable portfolio of 76 patents, he has advanced the field of printing technology, enhancing both the quality and efficiency of printed images.

Latest Patents

Among his latest innovations are two pivotal patents: a method for manufacturing a liquid ejection head substrate and a method for manufacturing a liquid ejection head. These methods are designed to minimize the degradation of print quality. The first patent involves categorizing components of the liquid ejection head substrate based on their required precision. A single-shot exposure method is utilized for parts where precise relative positional relationships are critical. In contrast, a split exposure method is employed for components that demand higher fabrication precision.

Another of his recent patents focuses on the print element substrate, which comprises a plurality of heaters that facilitate droplet discharge. This innovative substrate integrates a pad array for external electrical connections and incorporates resistance monitor elements to measure the heater's resistance values, ensuring optimal functionality and performance.

Career Highlights

Takaaki Yamaguchi has spent a significant portion of his career at Canon Kabushiki Kaisha, a leading company in imaging and printing technologies. His expertise in liquid ejection technology has been instrumental in developing new methods that push the boundaries of image quality and precision in printing applications.

Collaborations

Throughout his career, Yamaguchi has collaborated with esteemed colleagues such as Yoshiyuki Imanaka and Kousuke Kubo. These partnerships have been vital in fostering innovation and driving advancements in their shared field of expertise.

Conclusion

Takaaki Yamaguchi's impressive array of patents reflects his commitment to innovation in liquid ejection technologies. His developments not only enhance print quality but also introduce new manufacturing methods that pave the way for future advancements in the printing industry.

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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