logo

For the Inventor, By the Inventor

Ibaraki, Japan

Toshikazu Narahara

This inventor holds 41 USPTO granted patents, primarily in Thermosetting Resins. Top assignees: Hitachi, Ltd., Hitachi Chemical Company, Ltd., Hitachi Maxell, Limited. Active years: 1976-1993.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshikazu Narahara. Retrieved from https://idiyas.com/inventor/toshikazu-narahara

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

USPTO Granted Patents = 41

% Patents Active = 100.0

Average Co-Inventor Count = 4.7

ph-index = 11

Forward Citations = 357(Granted Patents)


Location History:

  • Ibaraki, JA (1977)
  • Hitachi, JA (1976 - 1978)
  • Hitachi, JP (1978 - 1981)
  • Tokaimura, JP (1978 - 1982)
  • Toukai, JP (1986)
  • Ibaragi, JP (1989)
  • Naka, JP (1978 - 1991)
  • Ibaraki, JP (1982 - 1993)
  • Tokai, JP (1983 - 1993)

Company Filing History:

goldMedal37 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal5 out of 1,641 
 
Hitachi Chemical Company, Ltd.
 patents
bronzeMedal1 out of 1,112 
 
Hitachi Maxell, Limited
 patents
4. 1 out of 172 
 
Nitto Electric Industrial Co., Ltd.
 patents
where one patent can have more than one assignee

Years Active: 1976-1993

Loading Chart...
Areas of Expertise:
Thermosetting Resin
Magnetic Recording Medium
Polymer Composition
Printed Circuit Board
Prepreg
Epoxy Resin
Lubricant Layer
Electric Windings
Crosslinkable Compound
Polyurethane Foam
Circuit Board
Thermal Transfer Sheet
41 patents (USPTO):Explore Patents
1. 5223594 - Flame-retardant resin composition containing a bromostyrene prepolymer (1993-06-29),
2. 5223342 - Magnetic recording medium having a lubricating layer comprising a binder (1993-06-29),
3. 5212244 - Thermosetting resin composition, and prepreg and laminated sheet which (1993-05-18),
4. 5166283 - Polymer having dihydropyridine rings or dihydrotriazine rings, process (1992-11-24),
5. 5128435 - Magnetic recording medium based on epoxy resins modified by isocyanates (1992-07-07),
6. 5080965 - Prepreg from poly(p-hydroxystyrene), epoxy-modified polybutadiene and (1992-01-14),
7. 5071715 - Magnetic recording medium with a lubricant layer containing a perfluoro (1991-12-10),
8. 5041478 - Resin composition for printed circuit board (1991-08-20),
9. 5028513 - Process for producing printed circuit board (1991-07-02),
10. 5021296 - Circuit board and process for producing the same (1991-06-04),
11. 4978596 - Electrophotographic toner comprising lactone-modified epoxy resin (1990-12-18),
12. 4946734 - Resin composition for printed circuit board and such board formed by use (1990-08-07),
13. 4933228 - Thermosetting resin and prepreg and laminate using the same (1990-06-12),
14. 4931507 - Composition comprising poly(p-hydroxystrene) derivative, epoxy-modified (1990-06-05),
15. 4900807 - Polymer from nitrile terminated compounds having Schiff bonds and (1990-02-13),

Title: Toshikazu Narahara: Innovator in Flame-Retardant Compositions

Introduction

Toshikazu Narahara, an esteemed inventor based in Ibaraki, Japan, is recognized for his significant contributions to the field of material science, particularly in the development of flame-retardant resins and magnetic recording media. With a remarkable portfolio of 41 patents, Narahara has made strides that enhance both safety and durability in various applications.

Latest Patents

Narahara's recent inventions include a groundbreaking flame-retardant resin composition. This innovative formula features a prepolymer that adheres to a specific general formula, where R1 can be a hydrogen atom or an unreactive saturated group and R2 signifies a reactive unsaturated group. The prepolymer allows for a curable composition that demonstrates uniform crosslinking density without significant stress concentration, making it highly suitable for multilayer printed wiring boards that require high thermal impact resistance and excellent heat resistance. Additionally, he developed a magnetic recording medium characterized by a non-magnetic substrate paired with a magnetic layer composed of an organic compound equipped with both a perfluoro group and a hydrocarbon group. This combination not only provides enhanced durability but also ensures a long-lasting lubricating effect.

Career Highlights

Narahara's professional journey includes pivotal roles at prominent companies such as Hitachi, Ltd. and Hitachi Chemical Company, Ltd., where he applied his expertise to research and development in advanced materials. His work has not only benefited these corporations but also advanced the industry standards for product safety and performance.

Collaborations

Throughout his career, Narahara has collaborated with notable colleagues, including Akio Takahashi and Akira Nagai. These partnerships have fostered an environment of innovation, leading to the creation of cutting-edge technologies in material science.

Conclusion

Toshikazu Narahara continues to be a key figure in the realm of inventions related to flame-retardant resins and magnetic materials. His commitment to enhancing product safety and performance through innovative solutions solidifies his reputation as a leading inventor. As he moves forward, the impact of his work is poised to benefit numerous industries.

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]
Loading…