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For the Inventor, By the Inventor

Urawa, Japan

Takao Nakagawa

This inventor holds 19 USPTO granted patents, primarily in Composite Materials. Top assignees: Across Co., Ltd., Fuji Standard Research, Inc., Fuji Oil Company Limited. Active years: 1985-2010.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takao Nakagawa. Retrieved from https://idiyas.com/inventor/takao-nakagawa

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

USPTO Granted Patents = 19

% Patents Active = 89.5

Average Co-Inventor Count = 4.3

ph-index = 9

Forward Citations = 249(Granted Patents)


Location History:

  • Ichikawa, JP (1985 - 1987)
  • Kashiwa, JP (1988 - 1993)
  • Kawaguchi, JP (1996 - 1997)
  • Urawa, JP (1996 - 2002)
  • Warabi, JP (2001 - 2003)
  • Saitama, JP (1999 - 2010)

Company Filing History:

goldMedal8 out of 8 
 
Across Co., Ltd.
 patents
silverMedal5 out of 12 
 
Fuji Standard Research, Inc.
 patents
bronzeMedal2 out of 225 
 
Fuji Oil Company Limited
 patents
4. 2 out of 5 
 
Fuji Standard Research Kabushiki Kaisha
 patents
5. 1 out of 146 
 
Daido Steel Co., Ltd.
 patents
6. 1 out of 2,208 
 
Fuji Jukogyo Kabushiki Kaisha
 patents
7. 1 out of 10,092 
 
Honda Giken Kogyo Kabushiki Kaisha
 patents
8. 1 out of 22,006 
 
Honda Motor Co., Ltd.
 patents
9. 1 out of 929 
 
Sumitomo Metal Industries, Inc.
 patents
10. 3 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1985-2010

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Areas of Expertise:
Friction Member
Center Differential Unit
Fiber-Composites
Titanium-Copper Composite
Clutch Disk
Spring Members
Heat-Resisting Material
Flexible Composite
Carbonaceous Pitch
Microspherical Carbonaceous
19 patents (USPTO):Explore Patents
1. 7832529 - Friction member for frictional engagement device and method for producing the same (2010-11-16),
2. 6620074 - Center differential unit and planetary gear (2003-09-16),
3. 6472058 - Fiber-composite material and method for producing the same (2002-10-29),
4. 6447893 - Fibrous composite material and process for producing the same (2002-09-10),
5. 6183667 - Titanium-and copper-containing carbon composite material and process for the production thereof (2001-02-06),
6. 5975270 - Clutch disk of C/C composite for a wet friction clutch, and process for (1999-11-02),
7. 5678809 - Spring members (1997-10-21),
8. 5579898 - Heat-resisting material and conveyer belt using same (1996-12-03),
9. 5503783 - Process of making a spring member (1996-04-02),
10. 5206085 - Preformed yarn useful for forming composite articles and process for (1993-04-27),
11. 5076872 - Process for preparing a flexible composite material (1991-12-31),
12. 4902453 - Process for the preparation of a fiber-reinforced carbon composite (1990-02-20),
13. 4772502 - Preformed yarn useful in forming composite articles and process of (1988-09-20),
14. 4770915 - Flexible composite material and process for preparing same (1988-09-13),
15. 4663022 - Process for the production of carbonaceous pitch (1987-05-05),

Title: Innovations of Takao Nakagawa: A Pioneer in Frictional Engagement Devices

Introduction

Takao Nakagawa is a notable inventor based in Urawa, Japan, recognized for his contributions to mechanical engineering, particularly in the field of frictional engagement devices. With an impressive portfolio of 19 patents, Nakagawa has made significant strides in enhancing the performance and efficiency of various mechanical components.

Latest Patents

Among Nakagawa's latest innovations are two pioneering patents that showcase his expertise. The first patent focuses on a friction member for frictional engagement devices and methods of production, aimed at reducing weight while enhancing impact resistance and improving sliding performance. This friction member, made from a carbon fiber/carbonaceous composite material, undergoes a heat treatment process, resulting in a porosity of 20-60%, optimizing its effectiveness in mechanical applications.

The second patent revolves around a planetary gear type center differential unit. This innovative design incorporates a carrier, first and second sun gears, and pinions, all while utilizing a pinion shaft made from carbon/carbon composite materials. This construction ensures optimal durability and performance, as the pinion shaft directly supports the pinion member during rotation, fostering efficient movement within the unit.

Career Highlights

Takao Nakagawa has built his career through impactful roles in esteemed organizations such as Across Co., Ltd. and Fuji Standard Research, Inc. His work has not only established him as a leading inventor but has also contributed to advancements in industrial applications of friction materials and gear systems, impacting various sectors that rely on reliable mechanical components.

Collaborations

Collaboration plays a significant role in the innovation process, and Nakagawa has worked alongside talented individuals like Mihoko Yamashita and Masaharu Tachibana. Their collective expertise has further enriched Nakagawa's inventions, facilitating effective problem-solving and creativity in product development.

Conclusion

Takao Nakagawa’s contributions to the field of mechanical engineering underscore his innovative spirit and commitment to advancing technology. With his extensive patent portfolio and collaborative efforts, he continues to shape the future of frictional engagement devices, demonstrating the profound impact that dedicated inventors can have on industries globally.

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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