Company Filing History:

9 out of 28,544

Ricoh Company, Ltd.

patents

2 out of 16

Ricoh Electronic Devices Co., Ltd.

patents

1 out of 20

Nisshinbo Micro Devices Inc.

Ricoh Electronics Devices Co., Ltd.

patent

Years Active: 2010-2025

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14 patents (USPTO):Sort by Forward CitationsExplore Patents

1. 12476551 - Switching power supply circuit (2025-11-18),

2. 11375593 - Lighting system provided with dimmer apparatus and lighting equipment (2022-06-28),

3. 10284075 - Overvoltage protection circuit for protecting overvoltage corresponding to wide range of input voltage (2019-05-07),

4. 10050517 - Power supply apparatus converting input voltage to predetermined output voltage and controlling output voltage based on feedback signal corresponding to output voltage (2018-08-14),

5. 9413243 - Non-insulating type switching power supply device (2016-08-09),

6. 8836300 - Step-down switching regulator (2014-09-16),

7. 8624566 - Current-mode control switching regulator and operations control method thereof (2014-01-07),

8. 8508963 - Step-down switching regulator capable of providing high-speed response with compact structure (2013-08-13),

9. 8207721 - Switching regulator capable of stable operation and improved frequency characteristics in a broad input and output voltage range and method for controlling operation thereof (2012-06-26),

10. 7884584 - Switching power supply circuit (2011-02-08),

11. 7876073 - Switching regulator with slope compensation and control method therefor (2011-01-25),

12. 7795849 - Synchronous rectification switching regulator, control circuit for synchronous rectification switching regulator, and control method for synchronous rectification switching regulator (2010-09-14),

13. 7679348 - Switching regulator (2010-03-16),

14. 7649346 - Switching regulator having a normal operational mode and a light-load operational mode (2010-01-19),

Title: The Innovative Contributions of Shohtaroh Sohma

Introduction

Shohtaroh Sohma is a prominent inventor based in Osaka, Japan. He has made significant contributions to the field of lighting technology, holding a total of 13 patents. His work focuses on enhancing the efficiency and functionality of lighting systems, showcasing his innovative spirit and technical expertise.

Latest Patents

One of Sohma's latest patents is a lighting system equipped with a dimmer apparatus and lighting equipment. This system utilizes a two-wire power supply line to connect the dimmer apparatus and the lighting equipment. The dimmer generates a DC voltage that includes a dimming PWM signal, which controls the brightness of the light emitting element based on the duty ratio of the PWM signal. Another notable patent is an overvoltage protection circuit designed to safeguard against overvoltage conditions. This circuit is connected between a rectifier circuit and a load, featuring a semiconductor switch controlled by a dedicated control circuit. When the rectified voltage exceeds a predetermined threshold, the control circuit turns off the switch to protect the load.

Career Highlights

Throughout his career, Sohma has worked with reputable companies such as Ricoh Company, Ltd. and Ricoh Electronic Devices Co., Ltd. His experience in these organizations has allowed him to develop and refine his innovative ideas, contributing to advancements in lighting technology.

Collaborations

Sohma has collaborated with notable colleagues, including Katsuhisa Furuse and Yasuhiro Ishizaka. These partnerships have fostered a creative environment that has led to the development of groundbreaking technologies in the field.

Conclusion

Shohtaroh Sohma's contributions to lighting technology through his patents and collaborations highlight his role as a key innovator in the industry. His work continues to influence advancements in efficient lighting solutions.

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