Hiroyuki Ishikawa

This inventor holds 9 USPTO granted patents. Top assignees: Rohm Co., Ltd., Kyocera Corporation. Active years: 1996-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroyuki Ishikawa. Retrieved from https://idiyas.com/inventor/hiroyuki-ishikawa-apelo39i

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

USPTO Granted Patents = 9

% Patents Active = 77.8

Average Co-Inventor Count = 2.1

ph-index = 5

Forward Citations = 66(Granted Patents)

Company Filing History:

Years Active: 1996-2025

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9 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12323128 - Oscillator (2025-06-03),

2. 10152926 - Driving circuit for light emitting element, light emitting device using same, and display apparatus (2018-12-11),

3. 8730228 - Driving circuit for light emitting diode (2014-05-20),

4. 8552971 - Driving circuit for light emitting diode (2013-10-08),

5. 6967469 - Battery charging method, battery charging circuit, and portable electronic device having a battery (2005-11-22),

6. 6897638 - Stabilized power supply unit having a current limiting function (2005-05-24),

7. 6822428 - Stabilized power supply unit having a current limiting function (2004-11-23),

8. 5886475 - EL element driving circuit and EL element lighting device using the same (1999-03-23),

9. 5565762 - DC/DC converter and audio device incorporating the same (1996-10-15),

Title: Hiroyuki Ishikawa: Innovator in Light Emitting Technologies

Introduction

Hiroyuki Ishikawa, an esteemed inventor based in Kyoto, Japan, has made significant contributions to the field of light emitting technologies. With a total of eight patents to his name, Ishikawa has demonstrated his commitment to innovation and advancement in this vital area of modern technology.

Latest Patents

His latest patents include a "Driving Circuit for Light Emitting Element" and a "Driving Circuit for Light Emitting Diode," both pivotal in enhancing the operational efficiency of light emitting devices. The former patent details a system where LED terminals are connected to light emitting units with adjustable driving currents supplied by respective current sources, ensuring optimal performance. The latter patent describes a pulse modulator that regulates the duty ratio of a first pulse signal to maintain the desired electrical state of an LED string, showcasing his focus on precision and control within electronic circuits.

Career Highlights

Ishikawa works at Rohm Co., Ltd., a renowned company specializing in semiconductor and electronic components. His innovative ideas have propelled advancements in light emission technologies, impacting various applications across industries. By consistently pushing the boundaries of technology, Ishikawa has established himself as a key figure in his field.

Collaborations

Throughout his career, Ishikawa has collaborated with fellow distinguished professionals, including Koichi Miyanaga and Sachito Horiuchi. Together, they have fostered a spirit of innovation within their projects, contributing to the successful development of groundbreaking technologies.

Conclusion

Hiroyuki Ishikawa's contributions to light emitting technologies exemplify the spirit of innovation. His patents not only enhance the functionality of light emitting devices but also pave the way for future advancements. As an inventor, Ishikawa continues to inspire others in the field, demonstrating the profound impact of creativity and collaboration in 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]