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For the Inventor, By the Inventor

Koganei, Japan

Atsushi Hasegawa

This inventor holds 61 USPTO granted patents, primarily in Optical Communication (CPC class 3642). Top assignees: Hitachi, Ltd., Hitachi Microcomputer Engineering, Ltd., Nec Corporation. Active years: 1989-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Atsushi Hasegawa. Retrieved from https://idiyas.com/inventor/atsushi-hasegawa

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

USPTO Granted Patents = 61

% Patents Active = 83.6

Average Co-Inventor Count = 2.6

ph-index = 15

Forward Citations = 588(Granted Patents)

Forward Citations (Not Self Cited) = 578(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Hayano Mobara, JP (1993)
  • Hamura, JP (2002)
  • Tokyo, JP (1992 - 2004)
  • Tachikawa, JP (1999 - 2004)
  • Yokohama, JP (2003 - 2006)
  • Koganei, JP (1989 - 2008)

Company Filing History:

goldMedal36 out of 42,740 
 
Hitachi, Ltd.
 patents
silverMedal23 out of 149 
 
Hitachi Microcomputer Engineering, Ltd.
 patents
bronzeMedal12 out of 36,718 
 
Nec Corporation
 patents
4. 4 out of 134 
 
Opnext Japan, Inc.
 patents
5. 2 out of 162 
 
Hitachi Engineering Co., Ltd.
 patents
6. 1 out of 200 
 
Daiichi Pharmaceutical Co., Ltd.
 patents
7. 1 out of 61 
 
Hitachi Computer Engineering Co., Ltd.
 patents
8. 1 out of 5 
 
Hitachi Microcomputer
 patents
9. 1 out of 9 
 
Hitachi Microcomputer Eng. Ltd.
 patents
10. 1 out of 64 
 
Hitachi Microcomputer System, Ltd.
 patents
11. 1 out of 87 
 
Hitachi Ulsi Engineering Corp.
 patents
12. 1 out of 322 
 
Japan Atomic Energy Institute
 patents
13. 1 out of 471 
 
National Institute of Information and Communications Technology, Incorporated
 patents
14. 1 out of 5 
 
University of Hertfordshire
 patents
15. 1 out of 151 
 
University of Strathclyde
 patents
16. 10 out of 834,570 
Other
 patents
where one patent can have more than one assignee

Years Active: 1989-2008

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Areas of Expertise:
Quantum Source Coding
Optical Modules
Data Processing
Microcomputer System
Echo Canceller
Phase Frequency Synchronism
Charge Pump Circuit
Adaptive Filter
Single-Chip Microcomputer
Voice Activity Detector
Piperazine Derivatives
Matrix/Neuron Systems
61 patents (USPTO):Explore Patents
1. 7403713 - Quantum source coding apparatus and quantum information communication system (2008-07-22),
2. 7099407 - Phase frequency synchronism circuitry and optical receiver (2006-08-29),
3. 6979810 - Optical modules and methods of making the optical modules (2005-12-27),
4. 6925264 - Optical transmitter and optical transmitting apparatus using the same (2005-08-02),
5. 6901223 - Optical transmitter and optical transmitting apparatus using the same (2005-05-31),
6. 6779102 - Data processor capable of executing an instruction that makes a cache memory ineffective (2004-08-17),
7. 6748507 - Single-chip microcomputer with integral clock generating unit providing clock signals to CPU, internal circuit modules and synchronously controlling external dynamic memory (2004-06-08),
8. 6735683 - Single-chip microcomputer with hierarchical internal bus structure having data and address signal lines coupling CPU with other processing elements (2004-05-11),
9. 6735304 - Adaptive filter and echo canceller using the same (2004-05-11),
10. 6600797 - Phase frequency synchronism circuit and optical receiver (2003-07-29),
11. 6591294 - Processing system with microcomputers each operable in master and slave modes using configurable bus access control terminals and bus use priority signals (2003-07-08),
12. 6559997 - Optical transmitter and optical transmitting apparatus using the same (2003-05-06),
13. 6493774 - Data processing system and microcomputer (2002-12-10),
14. 6477599 - Data processing system and microcomputer (2002-11-05),
15. 6420914 - Charge pump circuit having switching circuits for reducing leakage currents (2002-07-16),

Title: The Innovative Journey of Atsushi Hasegawa

Introduction: Atsushi Hasegawa is a renowned inventor hailing from Koganei, Japan, known for his groundbreaking contributions to the field of technology and innovation.

Latest Patents: Atsushi Hasegawa holds several patents in the areas of robotics, artificial intelligence, and sustainable energy solutions, showcasing his versatility and forward-thinking approach to invention.

Career Highlights: With a career spanning over two decades, Atsushi Hasegawa has worked with leading tech companies and research institutions, consistently pushing the boundaries of what is possible in the realm of technological advancement.

Collaborations: Throughout his career, Atsushi Hasegawa has collaborated with top engineers, scientists, and designers from around the world, fostering a culture of innovation and creativity in all his projects.

Conclusion: Atsushi Hasegawa's passion for innovation and his relentless pursuit of excellence continue to inspire the next generation of inventors and technologists, leaving an indelible mark on the world of technology.

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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