Kanagawa, Japan

Seiji Tsuyuki

This inventor holds 64 USPTO granted patents and 1 published patent application, primarily in Magnetic Tape Cartridges (CPC class G11B). Top assignees: Fuji Photo Film Company, Limited, Fujifilm Corporation, Fuij Photo Film Co., Ltd.. Active years: 2001-2011.

USPTO Granted Patents = 64 

% Patents Active = 70.3

Average Co-Inventor Count = 4.1

ph-index = 9

Forward Citations = 260(Granted Patents)

Forward Citations (Not Self Cited) = 235(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Odawara-shi, Kanagawa-ken, JP (2002 - 2003)
  • Oogi-cho, Odawara-shi, Kanagawa-ken, JP (2003)
  • Kanagawa-ken, JP (2001 - 2007)
  • Kanagawa, JP (2002 - 2008)
  • Odawara, JP (2006 - 2011)

Company Filing History:


Years Active: 2001-2011

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Areas of Expertise:
Magnetic Tape Cartridge
Mold Assembly
Relative Positioning
Reel Design
Brake Release
Chip Retaining Features
Assembly Method
Latch Spring
Urging Member
Housing Reel
Multi-Projection Brake
64 patents (USPTO):Explore Patents

Title: The Innovative Contributions of Seiji Tsuyuki

Introduction

Seiji Tsuyuki, based in Kanagawa, Japan, is a notable inventor with an impressive portfolio of 64 patents. His work primarily focuses on advancements in tape reel assemblies and magnetic tape cartridges, which showcase his expertise in engineering and innovation.

Latest Patents

Among his latest inventions is a mold assembly for molding tapered flanges. This innovative tape reel assembly features a reel hub with flanges that are molded through resin injection molding. Each flange has a tapered inside surface that slopes at a fixed angle, uniquely designed to enhance functionality. Tsuyuki’s other recent invention, a method for determining the relative position of a part of a magnetic tape cartridge, addresses the secure assembly of a release pad by robotic systems. This magnetic tape cartridge includes features such as a reel for winding the magnetic tape, a sturdy cartridge case, and a cleverly engineered cup-like hub that enhances the precision and effectiveness of the release mechanism.

Career Highlights

Seiji Tsuyuki has contributed significantly to the field through his tenures at esteemed companies, including Fuji Photo Film Company, Limited and Fujifilm Corporation. His innovations have not only advanced product designs but also improved manufacturing processes across the industry.

Collaborations

Throughout his career, Tsuyuki has collaborated with prominent colleagues such as Yusuke Ishihara and Hideaki Shiga. These partnerships have arguably played a crucial role in the development and refinement of his inventive concepts, leading to the successful patenting of numerous technologies.

Conclusion

Seiji Tsuyuki's dedication to innovation is evident through his extensive patent portfolio and significant contributions to tape reel and magnetic cartridge technologies. His work continues to influence advancements in the industry, marking him as an important figure among contemporary inventors in Japan.

Profile summary based on public USPTO records.
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