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For the Inventor, By the Inventor

Tokyo, Japan

Rion Company Ltd.


USPTO Granted Patents = 85

% Expired Patents = 25.9


Trademarks = 2

Forward Citations = 378

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127 inventors (with patents filed for the assignee):

goldMedal Tomonobu Matsuda (14 out of 14 patents)

silverMedal Takashi Iwakura (12 out of 18 patents)

bronzeMedal Masahiro Sunohara (7 out of 7 patents)

4.  Masaki Shimmura (7 out of 7 patents)

5.  Kazuma Sekimoto (6 out of 6 patents)

6.  Kaoru Kondo (6 out of 7 patents)

7.  Takashi Minakami (5 out of 5 patents)

8.  Takuya Tabuchi (5 out of 6 patents)

9.  Yuki Yamakawa (5 out of 5 patents)

10.  Akihiro Soeta (4 out of 4 patents)

11.  Shinichi Sakamoto (4 out of 24 patents)

12.  Keisuke Watanuki (4 out of 4 patents)

13.  Tsutomu Nakajima (3 out of 21 patents)

14.  Daisuke Sakaue (3 out of 3 patents)

15.  Kazuna Bando (3 out of 4 patents)


Core Competencies:
Electromechanical Transducer
Particle Counter
Microbial Particle Counting
Hearing Aid
Flow Cell
Aerosol Particle Detection
Acoustic Device
Calibration Method
Viable Particle Counting
Measurement Method
Audiometer
Light Scattering Detector

85 patents:

1. 12289579 - Electromechanical transducer (2025-04-29),
2. 12265008 - Particle measuring device (2025-04-01),
3. 12181398 - Particle measuring device and particle measuring method (2024-12-31),
4. 11774340 - Particle measuring device, calibration method, and measuring device (2023-10-03),
5. 11474017 - Microbial particle measuring apparatus and microbial particle measuring method (2022-10-18),
6. 11268894 - Flow cell and particle measuring device (2022-03-08),
7. 11262284 - Particle counter (2022-03-01),
8. 11252493 - Hearing device and earphone (2022-02-15),
9. 11215551 - Viable particle counting system and viable particle counting method (2022-01-04),
10. D938595 - Earphone (2021-12-14),
11. D938594 - Earphone (2021-12-14),
12. 11184720 - Electroacoustic transducer and acoustic device (2021-11-23),
13. 11178495 - Electromechanical transducer and electroacoustic transducer (2021-11-16),
14. 11119027 - Microbial particle counting system and microbial particle counting method (2021-09-14),
15. 11112344 - Particle measuring method and detection liquid (2021-09-07),
Company Overview
Rion Company Ltd., headquartered in Tokyo, specializes in advanced particle measurement technologies. The company develops and manufactures a range of instruments, including electromechanical transducers and particle counters, aimed at precise microbial particle counting and aerosol particle detection. Rion's innovations extend to acoustic devices and calibration methods, contributing significantly to fields such as environmental monitoring and healthcare, particularly in hearing aids. Their commitment to quality and precision positions them as a leader in the particle measurement sector.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

Rion Company Ltd. USPTO Patent Assignee Logo
85 Patents

#604 in Tokyo

#1,254 in Japan

#8,958 in the World

Tokyo, JP
Tokyo, Japan

Rion Company Ltd.

Forward Citations = 378

127 inventors:

goldMedal Tomonobu Matsuda (14 out of 14 patents)

silverMedal Takashi Iwakura (12 out of 18 patents)

bronzeMedal Masahiro Sunohara (7 out of 7 patents)

4.  Masaki Shimmura (7 out of 7 patents)

5.  Kazuma Sekimoto (6 out of 6 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Rion Company Ltd.. Retrieved from https://idiyas.com/company/rion-company

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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