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For the Inventor, By the Inventor

Tokyo, Japan

Toshimasa Namekawa

This inventor holds 52 USPTO granted patents and 1 published patent application, primarily in Semiconductor Memory (CPC class H02M). Top assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation. Active years: 1994-2025.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Toshimasa Namekawa. Retrieved from https://idiyas.com/inventor/toshimasa-namekawa

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

USPTO Granted Patents = 52 

% Patents Active = 53.8

Average Co-Inventor Count = 1.9

ph-index = 10

Forward Citations = 378(Granted Patents)

Forward Citations (Not Self Cited) = 350(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Yokohama, JP (1994)
  • Ota-ku, JP (2009 - 2011)
  • Tokyo, JP (2000 - 2015)
  • Ota Tokyo, JP (2018 - 2023)

Company Filing History:

goldMedal52 out of 53,262 
 
Kabushiki Kaisha Toshiba
 patents
silverMedal5 out of 1,703 
 
Toshiba Electronic Devices & Storage Corporation
 patents
where one patent can have more than one assignee

Years Active: 1994-2025

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Areas of Expertise:
Switching Power Circuit
DC-DC Converter
Nonvolatile Memory Device
Semiconductor Charge Pump
Power Supply Circuit
Digital Pulse Width Modulator
Memory Testing Circuit
Programmable Memory
Sense Amplifier Circuit
Integrated Circuit Device
Voltage Boost Power Supply
52 patents (USPTO):Explore Patents
1. 12267010 - Switching power circuit (2025-04-01),
2. 11601037 - Rectangular-wave-signal generating circuit and switching power supply (2023-03-07),
3. 11594963 - Switching power circuit (2023-02-28),
4. 11290010 - Switching power circuit (2022-03-29),
5. 10871793 - Constant voltage power source circuit (2020-12-22),
6. 9985549 - Control of a dead time in a DC-DC converter (2018-05-29),
7. 8928302 - Step-up/down type power supply circuit (2015-01-06),
8. 8716998 - DC-DC converter and digital pulse width modulator (2014-05-06),
9. 8279700 - Semiconductor electrically programmable fuse (eFuse) having a polysilicon layer not doped with an impurity ion and a programming method thereof (2012-10-02),
10. 8130562 - Semiconductor memory device having shift registers (2012-03-06),
11. 8120974 - Nonvolatile semiconductor memory device (2012-02-21),
12. 8116152 - Nonvolatile semiconductor memory device capable of preventing write-disturb and method of programming (2012-02-14),
13. 8045414 - Non-volatile semiconductor memory device (2011-10-25),
14. 8032815 - Semiconductor memory device (2011-10-04),
15. 7956397 - Semiconductor device, charge pumping circuit, and semiconductor memory circuit (2011-06-07),

Title: **The Innovative Mind of Toshimasa Namekawa**

Introduction

Toshimasa Namekawa, a prolific inventor based in Tokyo, Japan, has made significant contributions to the field of electrical engineering with a remarkable portfolio of 51 patents. His innovations particularly focus on cutting-edge technologies such as signal generation and power supply circuits, demonstrating his expertise in designing sophisticated electronic systems.

Latest Patents

Among his latest innovations are two notable patents: the rectangular-wave-signal generating circuit and a switching power supply system. The rectangular-wave-signal generating circuit consists of a sawtooth-wave output circuit, a first detector, a second detector, and a first PWM-signal output circuit. This circuit is adept at generating a sawtooth-wave signal that is synchronized with a clock signal. It employs a dual-detection mechanism to capture specific timings related to the sawtooth waveform, allowing for the efficient generation of a PWM signal based on these timings.

The switching power supply circuit represents another of Namekawa's advancements. This circuit effectively compares a reference voltage with the feedback voltage of the output and adjusts the output voltage based on this comparison. If the output current surpasses a predetermined threshold, the reference voltage is curtailed, ensuring stability and efficiency in power delivery.

Career Highlights

Toshimasa Namekawa has had a distinguished career, having worked with prestigious companies such as Kabushiki Kaisha Toshiba and Toshiba Electronic Devices & Storage Corporation. His roles at these organizations have allowed him to innovate and lead projects that push the boundaries of electronic design.

Collaborations

Throughout his career, Namekawa has collaborated with notable peers, including Hiroshi Ito and Osamu Wada. These collaborations have contributed to a rich exchange of ideas and the development of groundbreaking technologies in their field.

Conclusion

In summary, Toshimasa Namekawa stands as a beacon of innovation within the electronics industry. His extensive patent portfolio and contributions to notable companies underscore his role in advancing technology. With continued exploration in signal generation and power supply design, he is sure to remain a key figure in future innovations.

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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