% Expired Patents = 100.0

EPO Patents = 1

Forward Citations = 1

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8 inventors (with patents filed for the assignee):

Nobuaki Onagi (3 out of 38 patents)

Masami Nishida (3 out of 9 patents)

Yasutomo Aman (2 out of 24 patents)

4. Yoshimichi Takano (2 out of 10 patents)

5. Haruki Tokumaru (2 out of 7 patents)

6. Daiichi Koide (2 out of 6 patents)

7. Takeshi Kajiyama (2 out of 2 patents)

8. Kohji Tsukahara (1 out of 7 patents)

9. Koide Daiichi (0 patent)

10. Kajiyama Takeshi (0 patent)

11. Nishida Masami (0 patent)

12. Takano Yoshimichi (0 patent)

4 patents: Sort by Forward Citations

1. 8607259 - Disk laminate, disk cartridge, disk loading/unloading mechanism, disk conveying device, disk conveying mechanism, and thin disk driving system (2013-12-10),

2. 8549547 - Disk clamping mechanism and disk drive system, with movably supported clamper (2013-10-01),

3. 7885149 - Disk carrier device and disk drive (2011-02-08),

4. 7823172 - Disk apparatus with curved stabilizing member (2010-10-26),

Company Overview

Chotaro Engineering, Co. is a leading construction and engineering company that specializes in providing top-notch solutions for various infrastructure projects. With a team of highly skilled professionals and a dedication to quality, we aim to deliver projects that meet and exceed our clients' expectations. Our services range from design and planning to construction and maintenance, ensuring a seamless process from start to finish.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 6 2026

4 Patents

#4 in Sakado

#7,573 in Japan

Sakado, Japan

Chotaro Engineering, Co.

Forward Citations = 1

8 inventors:

Nobuaki Onagi (3 out of 38 patents)

Masami Nishida (3 out of 9 patents)

Yasutomo Aman (2 out of 24 patents)

4. Yoshimichi Takano (2 out of 10 patents)

5. Haruki Tokumaru (2 out of 7 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Chotaro Engineering, Co.. Retrieved from https://idiyas.com/company/chotaro-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]

1 patent (EPO):

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]