Matsumoto, Japan

Takumi Nagashima

This inventor holds 57 USPTO granted patents and 12 published patent applications and 8 EPO patents, primarily in Ink Cartridge Technology. Top assignees: Seiko Epson Corporation, Seiko Epson Corporaition. Active years: 2013-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takumi Nagashima. Retrieved from https://idiyas.com/inventor/takumi-nagashima

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

USPTO Granted Patents = 57 

% Patents Active = 100.0

 

Average Co-Inventor Count = 3.3

ph-index = 7

Forward Citations = 149(Granted Patents)

Forward Citations (Not Self Cited) = 121(Dec 10, 2025)


Location History:

  • Shiojiri, JP (2013 - 2016)
  • Nagano, JP (2015 - 2020)
  • Matsumoto, JP (2017 - 2024)

Company Filing History:


Years Active: 2013-2026

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Areas of Expertise:
Ink Cartridge
Printing System
Liquid Storage
Replenishment Container
Cartridge Unit
Liquid Ejection
Bottle Set
Manufacturing Method
Liquid Supply
Attachment System
Mounting Body
Packing Member
57 patents (USPTO):Explore Patents

Title: Takumi Nagashima - Innovator in Ink Technology

Introduction

Takumi Nagashima is an accomplished inventor based in Matsumoto, Japan. With an impressive portfolio of 46 patents, he has made significant contributions to the field of ink technology. His innovative spirit and technical expertise have established him as a prominent figure in the industry.

Latest Patents

One of Takumi Nagashima's latest inventions includes an ink replenishment container designed for efficient ink transfer into ink tanks. This advanced container features a main body, an ink outlet forming portion with a tubular component, and a spring valve system that ensures optimal functionality. The sealing mechanism within the container effectively maintains pressure while allowing for precise ink delivery, showcasing Nagashima's commitment to enhancing user experience in ink application.

Career Highlights

Throughout his career, Takumi Nagashima has worked primarily with Seiko Epson Corporation. His role within this prestigious company has allowed him to explore and develop various advancements in printing technology. His patents not only reflect his individual innovation but also the collaborative culture within Seiko Epson that fosters growth and creativity among its engineers.

Collaborations

In his journey as an inventor, Nagashima has collaborated with notable colleagues such as Tadahiro Mizutani and Taku Ishizawa. These partnerships have enriched his work and contributed to the successful development of several patented technologies.

Conclusion

Takumi Nagashima's extraordinary contributions to ink technology and his extensive patent portfolio position him as a leading innovator in the field. His ongoing dedication to research and development continues to inspire new advancements in printing solutions, making a significant impact on industry standards.

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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