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For the Inventor, By the Inventor

Tokyo, Japan

Sumitomo Dow Limited


USPTO Granted Patents = 13

% Expired Patents = 15.4


Trademarks = 1

Forward Citations = 128

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28 inventors (with patents filed for the assignee):

goldMedal Wataru Fujiwara (4 out of 4 patents)

silverMedal Naoyoshi Kawamoto (3 out of 3 patents)

bronzeMedal Noriko Kitamura (3 out of 3 patents)

4.  Kenichi Yamazaki (3 out of 3 patents)

5.  Junkoh Hyoda (3 out of 4 patents)

6.  Ichiro Sato (2 out of 5 patents)

7.  Yukio Tomari (2 out of 2 patents)

8.  Kiyoshi Ogura (2 out of 4 patents)

9.  Yoshikazu Hirose (1 out of 4 patents)

10.  Kenzo Chikanari (1 out of 9 patents)

11.  Mikio Kodama (1 out of 11 patents)

12.  Takeyoshi Nishio (1 out of 42 patents)

13.  Tadayuki Ohmae (1 out of 51 patents)

14.  Noboru Yamaguchi (1 out of 26 patents)

15.  Saburo Mishiba (1 out of 9 patents)


13 patents:

1. 7449506 - Flame-retardant polycarbonate resin composition (2008-11-11),
2. 6365654 - Transparent resin compositions with near infrared absorption characteristics (2002-04-02),
3. 6291585 - Transparent resin compositions containing a thiuram compound and certain copper compounds (2001-09-18),
4. 5811491 - Glass fiber-reinforced thermoplastic resin composition (1998-09-22),
5. 5807908 - Ionizing radiation-resistant polycarbonate resin composition and medical (1998-09-15),
6. 5703157 - Process of preparing copolymer latex and use thereof (1997-12-30),
7. 5656689 - Process for preparing copolymer latex and use thereof (1997-08-12),
8. 5648420 - Process of preparing copolymer latex and use thereof (1997-07-15),
9. 5508347 - Delustered amorphous thermoplastic resin composition (1996-04-16),
10. 5430101 - Delustered rubber modified styrenic blends (1995-07-04),
11. 5371142 - Thermoplastic resin composition comprising a polyester, a polycarbonate (1994-12-06),
12. 5290855 - Thermoplastic resin composition (1994-03-01),
13. 5284908 - Process for preparing copolymer latex and use of copolymer latex (1994-02-08),
Company Overview
Sumitomo Dow Limited is a prominent joint venture based in Tokyo, specializing in advanced materials and chemical solutions. The company focuses on the development and manufacturing of high-performance plastics and specialty chemicals, catering to various industries including automotive, electronics, and packaging. With a commitment to innovation, Sumitomo Dow integrates cutting-edge research and technology to enhance product performance and sustainability, positioning itself as a key player in the global materials market.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

13 Patents

#1,660 in Tokyo

#3,747 in Japan

#44,988 in the World

Tokyo, JP
Tokyo, Japan

Sumitomo Dow Limited

Forward Citations = 128

28 inventors:

goldMedal Wataru Fujiwara (4 out of 4 patents)

silverMedal Naoyoshi Kawamoto (3 out of 3 patents)

bronzeMedal Noriko Kitamura (3 out of 3 patents)

4.  Kenichi Yamazaki (3 out of 3 patents)

5.  Junkoh Hyoda (3 out of 4 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sumitomo Dow Limited. Retrieved from https://idiyas.com/company/sumitomo-dow

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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