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Tonen Chemical Corporation

USPTO Granted Patents = 47

% Expired Patents = 10.6

CIPO Patents = 12

EPO Patents = 3

Trademarks = 2

Forward Citations = 941

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94 inventors (with patents filed for the assignee):

Koichi Kono (16 out of 47 patents)

Kotaro Takita (13 out of 39 patents)

Norimitsu Kaimai (11 out of 15 patents)

4. Hidehiko Funaoka (7 out of 9 patents)

5. Shigeaki Kobayashi (7 out of 8 patents)

6. Kazuo Hirano (6 out of 23 patents)

7. Taiji Kambayashi (6 out of 12 patents)

8. Toshitake Nagai (6 out of 10 patents)

9. Osamu Komiyama (5 out of 9 patents)

10. Yuichiro Miura (5 out of 5 patents)

11. Takayuki Nate (5 out of 5 patents)

12. Masahisa Ohtsuka (5 out of 5 patents)

13. Hiroyuki Ozaki (4 out of 32 patents)

14. Satoshi Ueki (4 out of 32 patents)

15. Patrick Brant (3 out of 141 patents)

Core Competencies:

Microporous Membrane

Battery Separator

Polymeric Material

Polyolefin Film

Thermoplastic Resin

Copolymer

Artificial Snow

High-Strength Fabric

Polyarylene Sulfide

Catalyst Regeneration

Non-Woven Fabric

47 patents: Sort by Forward Citations

1. 8026005 - Microporous polyolefin membrane, its production method, battery separator, and battery (2011-09-27),

2. 7872086 - Polymeric material and its manufacture and use (2011-01-18),

3. 7815825 - Microporous polyolefin membrane, and method of producing the same (2010-10-19),

4. 7807287 - Multi-layer, microporous membrane, battery separator and battery (2010-10-05),

5. 7785735 - Microporous composite membrane and its producing method and use (2010-08-31),

6. 7781094 - Microporous composite membrane and its production method and use (2010-08-24),

7. 7700182 - Microporous polyolefin membrane, its production method, and battery separator (2010-04-20),

8. 7479243 - Microporous polyolefin membrane, and method of producing the same (2009-01-20),

9. 7105608 - Copolymer of propylene with a conjugated diene and a process of preparing the same (2006-09-12),

10. 6887944 - Modified polypropylene and process for producing same (2005-05-03),

11. 6824865 - Microporous polyolefin film and process for producing the same (2004-11-30),

12. 6762146 - Vanadium phosphorous mixed oxide (2004-07-13),

13. 6666969 - Microporous polyolefin film and process for producing the same (2003-12-23),

14. 6566012 - Polyolefin microporous film and method for preparing the same (2003-05-20),

15. 6245272 - Polyolefin microporous film and method for preparing the same (2001-06-12),

Company Overview

Tonen Chemical Corporation, based in Tokyo, specializes in advanced polymer technologies, focusing on the development and manufacturing of microporous membranes and polyolefin films. The company is recognized for its innovative solutions in battery separators and composite membranes, catering to various industries including energy storage and automotive applications. Additionally, Tonen produces polymeric materials and artificial snow granules, contributing to diverse sectors with its cutting-edge materials science expertise.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 20 2026

47 Patents

#825 in Tokyo

#1,779 in Japan

#14,827 in the World

Tonen Chemical Corporation

Forward Citations = 941

94 inventors:

Koichi Kono (16 out of 47 patents)

Kotaro Takita (13 out of 39 patents)

Norimitsu Kaimai (11 out of 15 patents)

4. Hidehiko Funaoka (7 out of 9 patents)

5. Shigeaki Kobayashi (7 out of 8 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Tonen Chemical Corporation. Retrieved from https://idiyas.com/company/tonen-chemical

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

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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