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For the Inventor, By the Inventor

Nasushiobara, Japan

Takeshi Ishihara

This inventor holds 19 USPTO granted patents and 2 published patent applications and 17 EPO patents, primarily in Lithium-Ion Battery Technology. Top assignees: Toray Battery Separator Film Co., Ltd., Toray Industries, Inc., Tonen Chemical Corporation. Active years: 2005-2022.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Takeshi Ishihara. Retrieved from https://idiyas.com/inventor/takeshi-ishihara-jytldhaj

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

Calculating rank
USPTO Granted Patents = 19 

% Patents Active = 94.7

 

Average Co-Inventor Count = 2.4

ph-index = 3

Forward Citations = 28(Granted Patents)


Location History:

  • Ibaraki, JP (2006)
  • Saitama-ken, JP (2015)
  • Kawagoe, JP (2005 - 2016)
  • Nasushlobara, JP (2018)
  • Nasushiobara, JP (2012 - 2021)
  • Tochigi, JP (2022)

Company Filing History:

goldMedal12 out of 50 
 
Toray Battery Separator Film Co., Ltd.
 patents
silverMedal5 out of 3,586 
 
Toray Industries, Inc.
 patents
bronzeMedal2 out of 47 
 
Tonen Chemical Corporation
 patents
4. 1 out of 1,766 
 
National Institute of Advanced Industrial Science and Technology
 patents
where one patent can have more than one assignee

Years Active: 2005-2022

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Areas of Expertise:
Microporous Membrane
Lithium-Ion Battery
Polyolefin
Battery Separator
Production Method
Multilayer Film
Polymeric Membranes
Copolymers
Modified Polypropylene
Film Applications
Separator Film
Membrane Production
19 patents (USPTO):Explore Patents
1. 11239530 - Microporous membrane lithium ion secondary battery and method of producing the microporous membrane (2022-02-01),
2. 11183734 - Microporous membrane, lithium ion secondary battery and method of producing the microporous membrane (2021-11-23),
3. 10411237 - Multilayer, microporous polyolefin membrane, and production method thereof (2019-09-10),
4. 9911956 - Polyolefin microporous film and method of producing same (2018-03-06),
5. 9744500 - Microporous polymeric membranes, battery separators, and production methods therefor (2017-08-29),
6. 9624349 - Polyolefin microporous film and method for producing same (2017-04-18),
7. 9502705 - Microporous film, methods for making such film, and use for such film as battery separator film (2016-11-22),
8. 9295950 - Microporous membranes, methods for making such membranes, and the use of such membranes as battery separator film (2016-03-29),
9. 9289728 - Microporous membranes, methods for making such membranes, and the use of such membranes as battery separator film (2016-03-22),
10. 9203071 - Multi-layer microporous film (2015-12-01),
11. 9147868 - Microporous films, methods for their production, and applications thereof (2015-09-29),
12. 9136517 - Microporous film, process for production of the film, and use of the film (2015-09-15),
13. 8951677 - Microporous membranes, methods for making such membranes, and the use of such membranes as battery separator film (2015-02-10),
14. 8846253 - Microporous membranes, methods for making these membranes, and the use of these membranes as battery separator films (2014-09-30),
15. 8841032 - Microporous membranes, methods for making such membranes, and the use of such membranes as battery separator film (2014-09-23),

Title: **Takeshi Ishihara: Innovator in Lithium-Ion Battery Technology**

Introduction

Takeshi Ishihara, an accomplished inventor based in Nasushiobara, Japan, has made significant contributions to the field of lithium-ion batteries. With a portfolio of 19 patents, he has advanced technologies that enhance battery performance and efficiency. His work revolutionizes the way we think about energy storage and has implications for various industries, including electronics and electric vehicles.

Latest Patents

Ishihara's most recent patents focus on the development of microporous membranes for lithium-ion secondary batteries. One notable patent describes a method for producing these membranes that suppresses thickness variation and reduces air resistance after compression at elevated temperatures (60°C or 80°C). The process involves stretching the membrane in different axial directions, ensuring uniform properties. Specifically, his microporous membranes achieve an average thickness of 15 µm or less, demonstrating excellent performance metrics, including a relative impedance of 140% or less after heat compression treatment, making them highly efficient for battery applications.

Career Highlights

Throughout his career, Takeshi Ishihara has worked with leading organizations in the field of materials science and battery technology. Significant experience was gained at Toray Battery Separator Film Co., Ltd. and Toray Industries, Inc., where he collaborated on innovative projects and pushed the boundaries of battery technology.

Collaborations

Ishihara has worked alongside talented professionals, including coworkers Satoshi Miyaoka and Koichi Kono. Their collaboration has fostered an environment of innovation, leading to breakthroughs in the development of advanced battery components. Together, they have made strides toward enhancing battery safety, longevity, and overall efficiency.

Conclusion

In summary, Takeshi Ishihara exemplifies the spirit of innovation in the lithium-ion battery sector. His patents reflect a deep commitment to advancing technology that enables better energy storage solutions. As the demand for efficient batteries continues to grow, Ishihara's contributions will remain pivotal in shaping the future of energy 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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