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For the Inventor, By the Inventor

Yamanashi, Japan

Tsutomu Shikagawa

This inventor holds 19 USPTO granted patents, primarily in Motor Drive Technology. Top assignee: Fanuc Corporation. Active years: 2011-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Tsutomu Shikagawa. Retrieved from https://idiyas.com/inventor/tsutomu-shikagawa

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

USPTO Granted Patents = 19

% Patents Active = 78.9

Average Co-Inventor Count = 2.3

ph-index = 4

Forward Citations = 31(Granted Patents)


Location History:

  • Yamanashi, JP (2011 - 2020)
  • Yamanashi-ken, JP (2020 - 2022)

Company Filing History:

goldMedal19 out of 6,287 
 
Fanuc Corporation
 patents

Years Active: 2011-2026

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Areas of Expertise:
Printed Circuit Board
Dynamic Brake Circuit
Motor Drive Device
Charging Control Unit
Failure Detection
Robot Arm
Machine Learning
Brake Control System
Current Control
Life Prediction Function
Fault Detection
Short Circuit Diagnosis
19 patents (USPTO):Explore Patents
1. 12684692 - Printed circuit board and dynamic brake circuit comprising same (2026-07-14),
2. 12525782 - Motor drive device provided with charging control unit (2026-01-13),
3. 11424696 - Motor drive device (2022-08-23),
4. 10922182 - Motor driving device and determination method (2021-02-16),
5. 10848073 - Motor drive apparatus equipped with discharge circuit of capacitor of DC link (2020-11-24),
6. 10823783 - Motor drive device having failure detection function (2020-11-03),
7. 10763765 - Brake control system and method of fault detection (2020-09-01),
8. 10715059 - Motor driving device and failure detecting method (2020-07-14),
9. 10456932 - Conduction path structure of robot (2019-10-29),
10. 10306813 - Apparatus with motor drive device, to which motor drive device can be easily attached (2019-05-28),
11. 10300598 - Robot with daisy-chainable robot arm (2019-05-28),
12. 10148211 - Machine learning apparatus and method for learning correction value in motor current control, correction value computation apparatus including machine learning apparatus and motor driving apparatus (2018-12-04),
13. 10090791 - Machine learning apparatus and method for learning correction value in motor current control, correction value computation apparatus including machine learning apparatus and motor driving apparatus (2018-10-02),
14. 10054640 - Motor driving device including dynamic braking circuit (2018-08-21),
15. 9933034 - Motor drive apparatus equipped with life prediction function for motor brake (2018-04-03),

Title: The Innovations of Tsutomu Shikagawa

Introduction

Tsutomu Shikagawa is a prominent inventor based in Yamanashi, Japan. He has made significant contributions to the field of motor drive technology, holding a total of 17 patents. His work has been instrumental in advancing the efficiency and functionality of motor drive devices.

Latest Patents

One of Shikagawa's latest patents is a motor drive device that includes a converter for converting AC voltage from an AC power supply into DC voltage. This device features a smoothing capacitor that smooths the DC voltage output from the converter, along with an inverter that converts the smoothed DC voltage back into AC voltage to drive a motor. Additionally, it incorporates a regenerative circuit that short-circuits the ends of the smoothing capacitor during an emergency stop, ensuring safety and reliability.

Another notable patent is a motor driving device and determination method that includes a rectifier circuit for rectifying AC input voltage to DC voltage. This device is equipped with a relay that outputs a contact signal when the input voltage is detected. It also features various detectors for monitoring input and capacitor voltages, along with storage units for data backup operations.

Career Highlights

Tsutomu Shikagawa is currently employed at Fanuc Corporation, a leading company in automation and robotics. His innovative work in motor drive technology has positioned him as a key figure in the industry. His patents reflect a deep understanding of electrical engineering and a commitment to enhancing motor performance.

Collaborations

Shikagawa has collaborated with notable coworkers such as Sou Saito and Kiichi Inaba. Their combined expertise has contributed to the successful development of advanced motor drive technologies.

Conclusion

Tsutomu Shikagawa's contributions to motor drive technology through his patents and work at Fanuc Corporation highlight his role as an influential inventor. His innovations continue to shape the future of automation and robotics.

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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