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For the Inventor, By the Inventor

Yokohama, Japan

Katsuhiko Haji

This inventor holds 10 USPTO granted patents and 1 published patent application. Top assignees: Nippon Oil Company, Nippon Mitsubishi Oil Corporation, Nippon Oil Company Co., Ltd. Active years: 1996-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Katsuhiko Haji. Retrieved from https://idiyas.com/inventor/katsuhiko-haji

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

USPTO Granted Patents = 10 

% Patents Active = 100.0

Average Co-Inventor Count = 2.8

ph-index = 4

Forward Citations = 50(Granted Patents)


Location History:

  • Yokoahma, JP (1999)
  • Kanagasa, JP (1999)
  • Yokohama, JP (1996 - 2003)

Company Filing History:

goldMedal8 out of 690 
 
Nippon Oil Company
 patents
silverMedal1 out of 84 
 
Nippon Mitsubishi Oil Corporation
 patents
bronzeMedal1 out of 1 
 
Nippon Oil Company Co., Ltd
 patent

Years Active: 1996-2003

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10 patents (USPTO):Explore Patents
1. 6514298 - Fuel additive and fuel composition (2003-02-04),
2. 5928393 - Fuel additive (1999-07-27),
3. 5863469 - Electrorheological fluid comprising lyotropic liquid crystalline polymer (1999-01-26),
4. 5746934 - Electro rheological fluid comprising lyotropic liquid crystalline polymer (1998-05-05),
5. 5705088 - Electrorheological fluid containing carbonaceous particles (1998-01-06),
6. 5679280 - Electro rheological fluid (1997-10-21),
7. 5536428 - Electro rheological fluid comprising lyotropic liquid crystalline polymer (1996-07-16),
8. 5536426 - Electrorheological fluid containing carbonaceous particles (1996-07-16),
9. 5523157 - Dispersion particles for fluid having magnetic and electrorheological (1996-06-04),
10. 5516445 - Fluid having magnetic and electrorheological effects simultaneously and (1996-05-14),

Title: Innovations of Katsuhiko Haji

Introduction

Katsuhiko Haji is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of fuel additives, holding a total of 10 patents. His work focuses on enhancing fuel compositions to improve engine performance and reduce harmful deposits.

Latest Patents

One of Haji's latest patents is a fuel additive that comprises a compound selected from a novel amine, along with oxygen-containing and nitrogen-containing compounds having specific structures. This innovative additive, when blended with gasoline, serves to suppress sludge or deposits in fuel intake systems or combustion chambers, particularly in automobile engines.

Career Highlights

Throughout his career, Katsuhiko Haji has worked with prominent companies such as Nippon Oil Company and Nippon Mitsubishi Oil Corporation. His experience in these organizations has allowed him to develop and refine his innovative ideas in fuel technology.

Collaborations

Haji has collaborated with notable colleagues, including Makoto Sasaki and Takafumi Ishii. Their combined expertise has contributed to the advancement of fuel additive technologies.

Conclusion

Katsuhiko Haji's work in fuel additives showcases his commitment to innovation in the automotive industry. His patents reflect a deep understanding of fuel chemistry and its applications in improving engine efficiency.

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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