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For the Inventor, By the Inventor

Tokyo, Japan

Sumitomo Forestry Co., Ltd.


USPTO Granted Patents = 24

% Expired Patents = 20.8

Trademarks = 1

Forward Citations = 110

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37 inventors (with patents filed for the assignee):

goldMedal Junichi Imai (12 out of 15 patents)

silverMedal Hiroki Nakashima (8 out of 10 patents)

bronzeMedal Kunio Kanai (5 out of 8 patents)

4.  Hiroki Ishiyama (4 out of 24 patents)

5.  Masayoshi Nakamura (4 out of 9 patents)

6.  Yoshinobu Kumakawa (3 out of 3 patents)

7.  Ryo Soda (3 out of 3 patents)

8.  Takayuki Masuko (3 out of 12 patents)

9.  Kentaro Nakamura (2 out of 2 patents)

10.  Kazuyuki Matsumura (1 out of 38 patents)

11.  Tomotake Morita (1 out of 9 patents)

12.  Hiroshi Takashima (1 out of 3 patents)

13.  Taisuke Nagashima (1 out of 1 patent)

14.  Hiroki Kagei (1 out of 1 patent)

15.  Kenji Umemura (1 out of 1 patent)


24 patents:

1. 12173347 - Technique for controlling molecular weight of PHA copolymer produced by halobacterium (2024-12-24),
2. D852029 - Connecting metal member for a column end (2019-06-25),
3. D850894 - Connecting metal member for a column end (2019-06-11),
4. 9828773 - Column end joint structure (2017-11-28),
5. 9739299 - Coupling member, method for producing coupling member, and wooden member joint structure (2017-08-22),
6. 9249817 - Wooden member joint structure (2016-02-02),
7. 9238909 - Column base joint structure (2016-01-19),
8. 8950126 - Wooden building skeleton (2015-02-10),
9. 8907012 - Production method for particle board and fiber board (2014-12-09),
10. 8857119 - Wooden member assembly (2014-10-14),
11. D708935 - Beam joint hardware (2014-07-15),
12. D700506 - Beam joint hardware (2014-03-04),
13. D698638 - Nut (2014-02-04),
14. 8511033 - Beam-column connection structure of continued beam connection portion (2013-08-20),
15. D678757 - Screw bolt (2013-03-26),
Company Overview
Sumitomo Forestry Co., Ltd. is a prominent player in the forestry and construction sectors, specializing in sustainable timber production and eco-friendly building solutions. The company focuses on developing innovative technologies for wood utilization and environmental conservation, contributing to sustainable urban development. With a strong commitment to research and development, Sumitomo Forestry engages in various initiatives aimed at enhancing the quality of life through advanced construction methods and sustainable practices, primarily serving markets in Japan and beyond.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 20 2026

24 Patents

#1,215 in Tokyo

#2,636 in Japan

#26,686 in the World

Tokyo, JP
Tokyo, Japan

Sumitomo Forestry Co., Ltd.

Forward Citations = 110

37 inventors:

goldMedal Junichi Imai (12 out of 15 patents)

silverMedal Hiroki Nakashima (8 out of 10 patents)

bronzeMedal Kunio Kanai (5 out of 8 patents)

4.  Hiroki Ishiyama (4 out of 24 patents)

5.  Masayoshi Nakamura (4 out of 9 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sumitomo Forestry Co., Ltd.. Retrieved from https://idiyas.com/company/sumitomo-forestry-company

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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