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For the Inventor, By the Inventor

Chiba, Japan

Sii Semiconductor Corporation


USPTO Granted Patents = 163

% Expired Patents = 62.6


Trademarks = 1

Forward Citations = 183

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108 inventors (with patents filed for the assignee):

goldMedal Masakazu Sugiura (15 out of 46 patents)

silverMedal Tsutomu Tomioka (12 out of 36 patents)

bronzeMedal Minoru Ariyama (9 out of 36 patents)

4.  Kotaro Watanabe (8 out of 24 patents)

5.  Hirofumi Harada (8 out of 43 patents)

6.  Makoto Mitani (8 out of 45 patents)

7.  Tomoki Hikichi (7 out of 35 patents)

8.  Fumihiko Maetani (7 out of 22 patents)

9.  Fumiyasu Utsunomiya (7 out of 76 patents)

10.  Toshiyuki Koike (7 out of 25 patents)

11.  Teruo Suzuki (6 out of 25 patents)

12.  Kosuke Takada (6 out of 24 patents)

13.  Masaru Akino (6 out of 19 patents)

14.  Akihiro Kawano (6 out of 15 patents)

15.  Katsuya Goto (6 out of 13 patents)


Core Competencies:
Sensor Circuit
Optical Sensor
Voltage Regulator
Semiconductor Device
Non-Volatile Memory
Battery Device
Reference Voltage
Magnetic Sensor
Integrated Circuit
Manufacturing Method
Charge Control
Current Detection

163 patents:

1. 10191124 - Sensor circuit (2019-01-29),
2. 10043848 - Semiconductor device and a method of manufacturing a semiconductor device (2018-08-07),
3. 9997645 - Optical sensor device (2018-06-12),
4. 9972625 - Method of manufacturing semiconductor integrated circuit device (2018-05-15),
5. 9966476 - Semiconductor memory device having first and second floating gates of different polarity (2018-05-08),
6. 9948302 - Level shift circuit (2018-04-17),
7. 9947706 - Semiconductor device having a light receiving element (2018-04-17),
8. 9941787 - Reference voltage generation circuit and DCDC converter having the same (2018-04-10),
9. 9941717 - Battery device (2018-04-10),
10. 9935030 - Resin-encapsulated semiconductor device (2018-04-03),
11. 9933798 - Voltage regulator (2018-04-03),
12. 9933494 - Voltage detection circuit (2018-04-03),
13. 9923458 - Booster circuit including a booster section configured to operate intermittently (2018-03-20),
14. 9923411 - Electronic device (2018-03-20),
15. 9917573 - Voltage detection circuit (2018-03-13),
Company Overview
Sii Semiconductor Corporation, headquartered in Chiba, Japan, specializes in the development and manufacturing of advanced semiconductor devices. The company focuses on a diverse range of core technologies, including sensor circuits, optical sensors, voltage regulators, and non-volatile memory solutions. Sii Semiconductor is dedicated to innovation in battery devices, reference voltage components, and magnetic sensors, positioning itself as a key player in the semiconductor industry, catering to various applications across multiple sectors.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 6 2026

163 Patents

#8 in Chiba

#813 in Japan

#5,064 in the World

Chiba, JP
Chiba, Japan

Sii Semiconductor Corporation

Forward Citations = 183

108 inventors:

goldMedal Masakazu Sugiura (15 out of 46 patents)

silverMedal Tsutomu Tomioka (12 out of 36 patents)

bronzeMedal Minoru Ariyama (9 out of 36 patents)

4.  Kotaro Watanabe (8 out of 24 patents)

5.  Hirofumi Harada (8 out of 43 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sii Semiconductor Corporation. Retrieved from https://idiyas.com/company/sii-semiconductor

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

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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