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For the Inventor, By the Inventor

Ibaraki, Japan

Tsugihiro Doi

This inventor holds 15 USPTO granted patents. Top assignee: Hitachi Maxell, Limited. Active years: 1989-2016.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsugihiro Doi. Retrieved from https://idiyas.com/inventor/tsugihiro-doi

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

USPTO Granted Patents = 15

% Patents Active = 53.3

Average Co-Inventor Count = 3.4

ph-index = 5

Forward Citations = 78(Granted Patents)


Location History:

  • Otokuni, JP (1989 - 1992)
  • Osaka, JP (2007)
  • Ibaraki, JP (2007 - 2009)
  • Kyoto, JP (2016)

Company Filing History:

goldMedal15 out of 1,112 
 
Hitachi Maxell, Limited
 patents

Years Active: 1989-2016

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15 patents (USPTO):Explore Patents
1. 9231272 - Electrode and method for producing the same (2016-01-05),
2. 7593177 - Recording/reproducing method of magnetic tape (2009-09-22),
3. 7545597 - Recording/reproducing method of magnetic tape (2009-06-09),
4. 7522381 - Recording medium built-in cartridge and cartridge built-in package (2009-04-21),
5. 7494728 - Magnetic tape and magnetic tape cartridge (2009-02-24),
6. 7445858 - Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette (2008-11-04),
7. 7309040 - Magnetic tape cartridge (2007-12-18),
8. 7291409 - Magnetic recording medium using magnetic powder having a core portion and an outer layer portion including a rare earth element and magnetic recording cassette (2007-11-06),
9. 7267896 - Magnetic tape and magnetic tape cartridge (2007-09-11),
10. 7259935 - Magnetic tape including an intermediate layer consisting essentially of a binder (2007-08-21),
11. 7253988 - Recording/reproducing method of magnetic tape (2007-08-07),
12. 7212372 - Magnetic tape and magnetic tape cartridge (2007-05-01),
13. 7170709 - Recording/reproducing method of magnetic tape (2007-01-30),
14. 5079096 - Magnetic recording medium comprising a substrate coated with a primer (1992-01-07),
15. 4828925 - Magnetic disc (1989-05-09),

Title: Innovations and Contributions of Tsugihiro Doi

Introduction

Tsugihiro Doi is an accomplished inventor based in Ibaraki, Japan, recognized for his significant contributions to the field of technology. With 15 patents to his name, Doi has made impressive strides in various domains, including the development of advanced materials and methods for enhancing data recording technologies.

Latest Patents

Doi's latest innovations include a groundbreaking electrode and a method for producing the same. This invention features an electrode consisting of a current collector with an active material-containing layer. The layer showcases a precise thickness range and includes diethyl carbonate, significantly enhancing its performance characteristics. Additionally, Doi has developed a recording/reproducing method for magnetic tape that enables increased recording density while minimizing errors due to fluctuations in tape width. His methodologies introduce innovative track width adjustments that optimize data recording even under varying environmental conditions.

Career Highlights

Currently affiliated with Hitachi Maxell, Limited, Tsugihiro Doi has played a pivotal role in advancing the company's technological capabilities. His extensive patent portfolio underscores his commitment to innovation and reflects his drive to push the boundaries of what is possible within his field.

Collaborations

Throughout his career, Doi has collaborated with esteemed colleagues, including Tetsutaro Inoue and Sadamu Kuse. These partnerships have fostered a creative environment that has allowed for the exchange of ideas and further innovation in their respective areas of expertise.

Conclusion

Tsugihiro Doi stands as a testament to the power of dedication and creativity in the realm of invention. His work continues to influence advancements in technology, demonstrating how innovative thinking can lead to breakthrough developments that propel industries forward. As an inventor, Doi's contributions reflect a blend of technical skill and forward-looking vision, positioning him as a key figure in contemporary innovation.

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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