% Expired Patents = 57.1

Forward Citations = 56

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14 inventors (with patents filed for the assignee):

Kakuichi Shiomi (5 out of 19 patents)

Atsushi Yamagishi (2 out of 4 patents)

Naoki Kanada (2 out of 2 patents)

4. Naritomo Meguro (2 out of 4 patents)

5. Hideyuki Tanaka (1 out of 71 patents)

6. Masanori Saito (1 out of 42 patents)

7. Naruto Yonemoto (1 out of 4 patents)

8. Noboru Takeichi (1 out of 1 patent)

9. Takeyasu Sakai (1 out of 1 patent)

10. Sounosuke Fukushima (1 out of 1 patent)

11. Ken Ito (1 out of 1 patent)

12. Motoharu Matsuzaki (1 out of 2 patents)

13. Keiko Hayashi (1 out of 4 patents)

14. Shoichi Kagayama (1 out of 1 patent)

7 patents: Sort by Forward Citations

1. 8665146 - Calculation method of the amount of zenith troposphere delay, and a correcting method of troposphere delay of satellite positioning signal (2014-03-04),

2. 7974600 - Mobile station, mobile station communication control method, base station, and communication system (2011-07-05),

3. 7678047 - Chaologic brain function diagnosis apparatus (2010-03-16),

4. 7640014 - Mobile station and method for controlling mobile station side communication, base station and method for controlling base station side communication, and communication system (2009-12-29),

5. 7446730 - Radio wave device (2008-11-04),

6. 7091994 - Method, system, and computer program for displaying screen information (2006-08-15),

7. 7030780 - Method for displaying position of an aircraft in a display for air traffic control (2006-04-18),

Company Overview

Electronic Navigation Research Institute (ENRI) is a leading research institute in the field of electronic navigation and communication systems. Established in 1961, ENRI conducts research and development in areas such as satellite navigation, maritime traffic management, and digital communication technologies. With a focus on innovation and collaboration, ENRI works with industry partners and government agencies to advance the field of electronic navigation and improve safety and efficiency in transportation.

Profile summary synthesized from public USPTO records and patent filings.

Company Badge

USPTO Data Jan 1 1976 - Oct 13 2026

7 Patents

#2,287 in Tokyo

#5,456 in Japan

Tokyo, Japan

Electronic Navigation Research Institute

Forward Citations = 56

14 inventors:

Kakuichi Shiomi (5 out of 19 patents)

Atsushi Yamagishi (2 out of 4 patents)

Naoki Kanada (2 out of 2 patents)

4. Naritomo Meguro (2 out of 4 patents)

5. Hideyuki Tanaka (1 out of 71 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Electronic Navigation Research Institute. Retrieved from https://idiyas.com/company/electronic-navigation-research-institute

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]