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For the Inventor, By the Inventor

Tokyo, Japan

Hiroshi Tokunaga

This inventor holds 51 USPTO granted patents and 2 EPO patents, primarily in Inkjet Printing Technology (CPC class B41J). Top assignees: Sony Corporation, Konishiroku Photo Industry Co., Ltd., Konica Corporation. Active years: 1978-2011.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroshi Tokunaga. Retrieved from https://idiyas.com/inventor/hiroshi-tokunaga

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

USPTO Granted Patents = 51

% Patents Active = 66.7


Average Co-Inventor Count = 4.1

ph-index = 13

Forward Citations = 452(Granted Patents)

Forward Citations (Not Self Cited) = 447(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JA (1978)
  • Chofu, JP (1987)
  • Hachioji, JP (1984 - 1994)
  • Tokyo, JP (1979 - 2011)

Company Filing History:

goldMedal29 out of 58,145 
 
Sony Corporation
 patents
silverMedal14 out of 1,252 
 
Konishiroku Photo Industry Co., Ltd.
 patents
bronzeMedal4 out of 3,106 
 
Konica Corporation
 patents
4. 2 out of 817 
 
Mitsui Minings & Melting Co., Ltd.
 patents
5. 2 out of 105 
 
Tokyo Juki Industrial Co., Ltd.
 patents

Years Active: 1978-2011

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Areas of Expertise:
Inkjet Printing
Print Head
Image Forming Apparatus
Piezoelectric Actuator
Electrostatic Recording
Sewing Machine
Color Image Processing
Liquid Discharge Head
Electronic-Component Alignment
Accounting Apparatus
Cleaning Device
Manufacturing Method
51 patents (USPTO):Explore Patents
1. 7997679 - Image forming apparatus and controlling method therefor (2011-08-16),
2. 7594319 - Electronic-component alignment method (2009-09-29),
3. 7474435 - Connection apparatus, connecting method, and storage medium for storing computer-readable program having connecting functions (2009-01-06),
4. 7373305 - Accounting apparatus, accounting method, and computer-readable program storage medium for storing program having accounting function (2008-05-13),
5. 7324227 - Connection apparatus for connecting a source over a network to a predetermined destination, connecting method, and storage medium for storing computer-readable program having connecting functions (2008-01-29),
6. 7251883 - Electronic-component alignment method and apparatus therefor (2007-08-07),
7. 7216111 - Accounting apparatus, accounting method, and computer-readable program storage medium for storing program having accounting function (2007-05-08),
8. 7156485 - Liquid discharge head, cleaning method thereof, and liquid discharge apparatus (2007-01-02),
9. 7150514 - Print head, manufacturing method therefor, and printer (2006-12-19),
10. 7100254 - Method of manufacturing an ink-jet printhead (2006-09-05),
11. 6938981 - Image formation apparatus and control method thereof (2005-09-06),
12. 6938980 - Image forming apparatus and its control method (2005-09-06),
13. 6932464 - Piezoelectric actuator and its manufacturing method and ink-jet printhead (2005-08-23),
14. 6871941 - Print head, manufacturing method therefor, and printer (2005-03-29),
15. 6817699 - Printer (2004-11-16),

Title: Hiroshi Tokunaga: Pioneering Inventor from Tokyo

Introduction: Hiroshi Tokunaga is a renowned inventor hailing from Tokyo, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Hiroshi Tokunaga holds several patents in the areas of robotics, artificial intelligence, and renewable energy technologies, showcasing his continuous commitment to pushing the boundaries of technological advancement.

Career Highlights: With over two decades of experience in the tech industry, Hiroshi Tokunaga has worked with leading research institutions and multinational corporations, spearheading projects that have revolutionized various sectors.

Collaborations: Throughout his career, Hiroshi Tokunaga has collaborated with top universities and innovative startups, fostering a culture of creativity and forward thinking in the pursuit of cutting-edge solutions to complex problems.

Conclusion: Hiroshi Tokunaga's passion for innovation and his relentless drive to create a better future through technology make him a true visionary in the world of inventions.

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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