% Expired Patents = 16.7

Forward Citations = 67

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8 inventors (with patents filed for the assignee):

Kenjiro Futami (3 out of 3 patents)

Hiroshi Futami (3 out of 3 patents)

Hirotaka Yamashiro (1 out of 1 patent)

4. Yasuhisa Maeda (1 out of 1 patent)

5. Shuichi Saitoh (1 out of 2 patents)

6. Katsuhisa Kashiwazaki (1 out of 2 patents)

7. Katsumi Yamashita (1 out of 1 patent)

8. Kazutoshi Kaibara (1 out of 1 patent)

6 patents: Sort by Forward Citations

1. 8673456 - Composite plated film and laminated film (2014-03-18),

2. 6580541 - System and method for transmitting information for amphibious traveling vehicle and system for controlling operation of the vehicle (2003-06-17),

3. 6471857 - Filter apparatus with sand filter bed (2002-10-29),

4. 6058848 - Underwater and land travel system (2000-05-09),

5. 5775226 - Underwater and land travel vehicle (1998-07-07),

6. 5215016 - Rail type underwater travel vehicle (1993-06-01),

Company Overview

Koyo Engineering Co., Ltd. is a leading engineering and construction company based in Japan. With a strong focus on innovation and quality, Koyo Engineering specializes in providing civil engineering, design, and project management services for a wide range of projects. From infrastructure development to environmental engineering, Koyo Engineering is committed to delivering comprehensive solutions that meet the needs of their clients.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

6 Patents

#6 in Utsunomiya

#5,989 in Japan

Utsunomiya, Japan

Koyo Engineering Co., Ltd.

Forward Citations = 67

8 inventors:

Kenjiro Futami (3 out of 3 patents)

Hiroshi Futami (3 out of 3 patents)

Hirotaka Yamashiro (1 out of 1 patent)

4. Yasuhisa Maeda (1 out of 1 patent)

5. Shuichi Saitoh (1 out of 2 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Koyo Engineering Co., Ltd.. Retrieved from https://idiyas.com/company/koyo-engineering-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]