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For the Inventor, By the Inventor

Tokyo, Japan

Showa Denka K.k.

Calculating rank
USPTO Granted Patents = 11

% Expired Patents = 36.4

Forward Citations = 135

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32 inventors (with patents filed for the assignee):

goldMedal Hitoshi Yokouchi (1 out of 6 patents)

silverMedal Hisayuki Miki (1 out of 56 patents)

bronzeMedal Masatoshi Kunisawa (1 out of 1 patent)

4.  Kazumi Naito (1 out of 112 patents)

5.  Takashi Udagawa (1 out of 74 patents)

6.  Noritaka Muraki (1 out of 20 patents)

7.  Munetaka Watanabe (1 out of 8 patents)

8.  Akinori Sudoh (1 out of 1 patent)

9.  Masataka Takeuchi (1 out of 1 patent)

10.  Kazuhiro Omori (1 out of 29 patents)

11.  Hitoshi Atobe (1 out of 12 patents)

12.  Hirohiko Ohtsubo (1 out of 6 patents)

13.  Yasushi Ohono (1 out of 1 patent)

14.  Masahiro Ohmori (1 out of 27 patents)

15.  Junichi Torisu (1 out of 4 patents)


11 patents:

1. 9478366 - Electric storage device and method for producing the same (2016-10-25),
2. 8080228 - Graphite material, carbon material for battery electrode, and battery (2011-12-20),
3. 7399994 - Transparent electrode (2008-07-15),
4. 7365366 - Boron phosphide-based semiconductor light-emitting device and production method thereof (2008-04-29),
5. 7012798 - Capacitor (2006-03-14),
6. 6955801 - High-purity fluorine gas, production and use thereof, and method for analyzing trace impurities in high-purity fluorine gas (2005-10-18),
7. 6504712 - Heat sinks for CPUs for use in personal computers (2003-01-07),
8. 5188956 - Thermostable amylase (1993-02-23),
9. 5000760 - CBN abrasive-grains, method for producing the same, and grinding wheel (1991-03-19),
10. 4879192 - Secondary cell (1989-11-07),
11. 4278820 - Process for preparing monoalkylene glycol monoethers (1981-07-14),
Company Overview
Showa Denka K.K. is a diversified chemical company based in Tokyo, Japan, specializing in the development and manufacturing of a wide range of products across various sectors. The company focuses on advanced materials, chemicals, and pharmaceuticals, with significant expertise in areas such as semiconductor materials, specialty chemicals, and polymer products. Showa Denka is committed to innovation and sustainability, leveraging its research capabilities to address global challenges and enhance the quality of life through its diverse product offerings.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

11 Patents

#1,810 in Tokyo

#4,142 in Japan

#51,831 in the World

Tokyo, JP
Tokyo, Japan

Showa Denka K.k.

Forward Citations = 135

32 inventors:

goldMedal Hitoshi Yokouchi (1 out of 6 patents)

silverMedal Hisayuki Miki (1 out of 56 patents)

bronzeMedal Masatoshi Kunisawa (1 out of 1 patent)

4.  Kazumi Naito (1 out of 112 patents)

5.  Takashi Udagawa (1 out of 74 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Showa Denka K.k.. Retrieved from https://idiyas.com/company/showa-denka-k-k

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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