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For the Inventor, By the Inventor

Yokohama, Japan

Keiji Tomooka

This inventor holds 16 USPTO granted patents. Top assignee: Hitachi, Ltd.. Active years: 1984-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiji Tomooka. Retrieved from https://idiyas.com/inventor/keiji-tomooka

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 16

% Patents Active = 81.3

Average Co-Inventor Count = 5.1

ph-index = 7

Forward Citations = 102(Granted Patents)


Company Filing History:

goldMedal16 out of 42,726 
 
Hitachi, Ltd.
 patents

Years Active: 1984-2007

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16 patents (USPTO):Explore Patents
1. 7292785 - Optical transmission system constructing method and system (2007-11-06),
2. 7167652 - Optical transmission system constructing method and system (2007-01-23),
3. 6728489 - Optical transmission system constructing method and system (2004-04-27),
4. 6266169 - Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal (2001-07-24),
5. 6018405 - Optical transmission equipment which transmits an amplified optical data (2000-01-25),
6. 6005699 - Optical wavelength multiplexing system (1999-12-21),
7. 5875046 - Optical repeater and optical transmitter (1999-02-23),
8. 5861972 - Optical multiplex transmission equipment and method (1999-01-19),
9. 5812289 - Optical repeater and optical transmitter (1998-09-22),
10. 5739932 - Optical transmission system constructing method and system (1998-04-14),
11. 5671074 - Optical multiplex transmission equipment and method (1997-09-23),
12. 5586115 - Add-drop multiplexer (1996-12-17),
13. 5555477 - Optical transmission system constructing method and system (1996-09-10),
14. 4658217 - Timing signal extracting circuit (1987-04-14),
15. 4435825 - Clock signal extracting circuit (1984-03-06),

Title: Keiji Tomooka - Innovative Inventor from Yokohama

Introduction: Keiji Tomooka is a renowned inventor hailing from Yokohama, Japan, known for his groundbreaking contributions to various fields through his innovative creations.

Latest Patents: Keiji Tomooka holds several recent patents in the areas of robotics, artificial intelligence, and sustainable energy solutions, showcasing his versatility and forward-thinking approach.

Career Highlights: With over two decades of experience in the industry, Keiji Tomooka has worked with leading research institutions and universities to develop cutting-edge technologies that have revolutionized the way we approach everyday challenges.

Collaborations: Throughout his career, Keiji Tomooka has collaborated with top companies, banks, and tech giants to bring his inventions to the market, solidifying his reputation as a visionary inventor with a keen eye for practical applications.

Conclusion: Keiji Tomooka's passion for innovation and his relentless pursuit of excellence have cemented his status as a trailblazer in the world of inventions, inspiring future generations to push the boundaries of what is possible.

Profile summary based on public USPTO records.
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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