Yoshihiro Ikefuji

This inventor holds 40 USPTO granted patents and 1 published patent application, plus 1 CIPO patent and 1 EPO patent, primarily in Non-Contact Power Systems. Top assignees: Rohm Co., Ltd., Rohn Co., Ltd.. Active years: 1986-2021.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshihiro Ikefuji. Retrieved from https://idiyas.com/inventor/yoshihiro-ikefuji

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

USPTO Granted Patents = 40 (Patent Applications = 1)

% Patents Active = 90.0

CIPO Patents = 1 (Patent Applications = 1)

EPO Patents = 1

Average Co-Inventor Count = 1.8

ph-index = 14

Forward Citations = 547(Granted Patents)

Location History:

Ukyo, JP (1994)
Kyoto, JP (1986 - 2021)

Company Filing History:

Years Active: 1986-2021

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Areas of Expertise:

Non-Contact Power Feeding

Power Transmission Device

NFC Charging System

Power Reception Device

Authentication System

Semiconductor Chips

Data Communication

Liquid Crystal Display

Telecommunication Device

IC Card

Circuit Chip Module

40 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 10998767 - Power transmission device and non-contact power feeding system for transmitting electric power to power reception device by magnetic resonance (2021-05-04),

2. 10923962 - Power transmission device non-contact power feeding system with detection circuit to detect current amplitude in transmission-side coil (2021-02-16),

3. 10778046 - Power transmitting device and non-contact power feeding system (2020-09-15),

4. 10756559 - Non-contact power feeding system (2020-08-25),

5. 10700554 - Power reception device and non-contact power feeding system (2020-06-30),

6. 10601258 - Non-contact power supply system and power transmission device (2020-03-24),

7. 10530187 - Non-contact power supply system (2020-01-07),

8. 10432029 - Power transmission device and non-contact power feeding system (2019-10-01),

9. 10424977 - Charging system using NFC, mobile device chargeable by NFC, and charger (2019-09-24),

10. 9819213 - Power reception apparatus, power transmission apparatus, non-contact power supply system, power reception method, and power transmission method (2017-11-14),

11. 7961918 - Personal identification device and electronic apparatus provided therewith (2011-06-14),

12. 7773271 - Filter circuit, and image sensor, image sensor module, and image reading apparatus provided therewith (2010-08-10),

13. 7221427 - Method of making semiconductor chips for liquid crystal display device (2007-05-22),

14. 7003678 - IC card and IC chip module (2006-02-21),

15. 6842859 - Authentication system, authentication device, authentication data producing device, and authentication method (2005-01-11),

Title: Yoshihiro Ikefuji: Innovator in Non-Contact Power Feeding Systems

Introduction

Yoshihiro Ikefuji is a remarkable inventor based in Kyoto, Japan, with an impressive portfolio of 40 patents. His contributions to the field of power transmission and innovative systems have marked significant advancements in technology, particularly in non-contact power feeding methods.

Latest Patents

Among his latest inventions are two noteworthy patents: the "Power Transmission Device" and the "Non-Contact Power Feeding System for Transmitting Electric Power to Power Reception Device by Magnetic Resonance." The first patent outlines a power transmission apparatus that employs a magnetic field resonance system to transmit power to a reception apparatus. This system involves the division of the output AC voltage produced by a class E amplifier, which is then supplied to a resonance circuit. The innovative design allows for the evaluation of current amplitude in the power-transmission side coil to ascertain the presence of foreign objects before executing power transmission.

The second patent enhances this concept by incorporating a detection circuit that monitors the current amplitude flowing through the transmission-side coil. If the current amplitude falls outside a predetermined normal range, it conclusively indicates the presence of a foreign object, triggering a safety response that halts power transmission.

Career Highlights

Yoshihiro has made notable contributions while working with esteemed organizations such as Rohm Co., Ltd. and Rohn Co., Ltd. His tenure at these companies has allowed him to further refine his innovative ideas and apply cutting-edge technologies in practical applications.

Collaborations

Throughout his career, Ikefuji has collaborated with accomplished colleagues, including Shigemi Chimura and Hiroharu Okada. These partnerships have facilitated rich exchanges of ideas and fostered developments in their shared field of expertise.

Conclusion

Yoshihiro Ikefuji stands out as a leading figure in the realm of power transmission technologies. His inventions in non-contact power feeding systems showcase not only his ingenuity but also the potential for safer and more efficient power delivery methods. With 40 patents to his name, he continues to push the boundaries of innovation, shaping the future of electrical engineering.

Profile summary based on public USPTO records.