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For the Inventor, By the Inventor

Kariya, Japan

Kenji Takenaka

This inventor holds 76 USPTO granted patents, primarily in Variable Displacement Compressors (CPC class 4172). Top assignees: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Taiho Kogyo Co., Ltd., Kabushiki Kaisha Toyota Jidoshokki. Active years: 1983-2003.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Kenji Takenaka. Retrieved from https://idiyas.com/inventor/kenji-takenaka

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

USPTO Granted Patents = 76

% Patents Active = 98.7

Average Co-Inventor Count = 3.6

ph-index = 15

Forward Citations = 928(Granted Patents)

Forward Citations (Not Self Cited) = 872(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Aichi, JP (1984 - 1999)
  • Aichi-ken, JP (2000 - 2002)
  • Kariya, JP (1983 - 2003)

Company Filing History:

goldMedal70 out of 1,343 
 
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
 patents
silverMedal3 out of 288 
 
Taiho Kogyo Co., Ltd.
 patents
bronzeMedal2 out of 1,902 
 
Kabushiki Kaisha Toyota Jidoshokki
 patents
4. 1 out of 6 
 
Taiho Kogyo Kabushiki Kaisha
 patents
5. 1 out of 1 
 
Toyoda Jidoshokki Seisakusho Kabushiki Kaisha
 patent
6. 2 out of 834,513 
Other
 patents
where one patent can have more than one assignee

Years Active: 1983-2003

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Areas of Expertise:
Variable Displacement Compressor
Automotive Air Conditioning
Compressor Piston
Heat Generator
Swash Plate
Control Valve
Viscous Fluid Heater
Fluid Friction Heaters
Pressure Passages
Piston Type Compressor
Auxiliary Apparatus
Heating System
76 patents (USPTO):Explore Patents
1. 6659733 - Variable displacement compressor (2003-12-09),
2. 6517321 - Variable displacement compressor (2003-02-11),
3. 6513417 - Single-headed swash-plate-type compressor with hollowed and ribbed piston (2003-02-04),
4. D460460 - Compressor for a vehicle air conditioner (2002-07-17),
5. 6393849 - Air-conditioning apparatus and control procedure for variable displacement compressor (2002-05-28),
6. D457531 - Compressor piston (2002-05-22),
7. 6386279 - Automotive air-conditioning apparatus (2002-05-14),
8. 6356825 - Air-conditioning system for automobiles and its control method (2002-03-12),
9. 6308615 - Compressor (2001-10-30),
10. 6283722 - Variable displacement type compressor (2001-09-04),
11. 6213882 - Power transmission mechanism and its assembly method (2001-04-10),
12. 6189434 - Single-headed piston type swash-plate-operated compressor and a method of producing a swash plate (2001-02-20),
13. 6164262 - Auxiliary apparatus for a vehicle (2000-12-26),
14. 6158970 - Variable displacement compressor (2000-12-12),
15. 6158665 - Heat generator (2000-12-11),

Title: Kenji Takenaka: Innovator in Variable Displacement Compressors

Introduction

Kenji Takenaka is an accomplished inventor based in Kariya, Japan, with an impressive portfolio of 76 patents to his name. His innovative work primarily focuses on advancements in compressor technology, specifically variable displacement compressors, which find applications in various industries.

Latest Patents

Among his latest contributions, Takenaka has developed a groundbreaking variable displacement compressor that features a cylinder block connected to a valve plate. This design includes cylinder bores housing pistons that efficiently compress gas. A swash plate attached to the pistons transforms the drive shaft's rotation into reciprocating motion of the pistons. A cylindrical body, also housed in the supporting hole, is manipulated by a coil spring to maintain optimal force transmission from the swash plate to the valve plate. Moreover, he has designed a second variable displacement compressor that incorporates a crank chamber within its housing, enhancing its functionality and efficiency.

Career Highlights

Throughout his career, Takenaka has made significant strides in the field of mechanical engineering. He has worked for notable companies, including Toyota Industries Corporation and Taiho Kogyo Co., Ltd. His work has contributed significantly to advancements in automotive and industrial applications, highlighting his expertise in compressor mechanisms.

Collaborations

Takenaka has collaborated with esteemed colleagues, such as Hiroaki Kayukawa and Kazuya Kimura. Together, they have shared insights and expertise that have enriched the development of innovative compressor technologies. This collaborative spirit has fostered a culture of innovation and excellence in their projects.

Conclusion

Kenji Takenaka's dedication to innovation in the field of variable displacement compressors is evident through his extensive patent portfolio and impactful designs. His contributions not only enhance mechanical efficiency but also ensure reliability and performance in various applications. As an inventor, Takenaka continues to inspire future generations with his remarkable advancements in technology.

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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