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For the Inventor, By the Inventor

Tokyo, Japan

Atago Co., Ltd.


USPTO Granted Patents = 21

% Expired Patents = 14.3


Trademarks = 2

Forward Citations = 63

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21 inventors (with patents filed for the assignee):

goldMedal Hideyuki Amamiya (21 out of 21 patents)

silverMedal Yoshiaki Torigoe (5 out of 5 patents)

bronzeMedal Masanosuke Tanaka (4 out of 4 patents)

4.  Yoshinori Nakashima (4 out of 4 patents)

5.  Kiminori Sekiguchi (3 out of 3 patents)

6.  Keiji Kawada (3 out of 3 patents)

7.  Akihito Kubota (2 out of 3 patents)

8.  Junichi Matsumoto (2 out of 134 patents)

9.  Junji Higuchi (2 out of 2 patents)

10.  Yoshinori Nakajima (2 out of 2 patents)

11.  Yasuhiko Amagasa (2 out of 2 patents)

12.  Mitsunori Shinbo (2 out of 2 patents)

13.  Takeshi Kubodera (2 out of 3 patents)

14.  Tomohiro Kiire (1 out of 3 patents)

15.  Masaki Osawa (1 out of 1 patent)


21 patents:

1. 11796501 - Glass electrode and liquid property measurement device (2023-10-24),
2. 11474015 - Viscosity measurement unit and viscometer (2022-10-18),
3. 11249041 - Oil deterioration detector, sensor cover of oil deterioration detector, and method of measuring degree of oil deterioration (2022-02-15),
4. 11099127 - Nondestructive measurement apparatus (2021-08-24),
5. D922221 - Sample temperature controller (2021-06-15),
6. D906143 - Salinometer, saccharimeter and pH meter (2020-12-29),
7. 10801938 - Viscometer using reaction torque measurement based on rotational phase difference (2020-10-13),
8. 10429332 - Oil degradation meter and method for evaluating oil degradation (2019-10-01),
9. D851523 - Viscometer (2019-06-18),
10. D820703 - Folding carbonic acid concentration measuring instrument (2018-06-19),
11. D820702 - Folding carbonic acid concentration measuring instrument (2018-06-19),
12. D796362 - Viscometer (2017-09-05),
13. 9709489 - Device for measuring polarization degree and refractive index (2017-07-18),
14. D788623 - pH meter (2017-06-06),
15. D750517 - Part of a polarimeter and refractometer (2016-03-01),
Company Overview
Atago Co., Ltd. is a Tokyo-based company specializing in the development and manufacturing of precision measurement instruments. The organization focuses on optical measurement technologies, particularly in the fields of refractometry and density measurement. Atago's products are widely used across various industries, including food and beverage, pharmaceuticals, and chemical manufacturing, providing essential tools for quality control and analysis. The company is recognized for its commitment to innovation and high standards in measurement accuracy.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 13 2026

Atago Co., Ltd. USPTO Patent Assignee Logo
21 Patents

#1,310 in Tokyo

#2,862 in Japan

#29,961 in the World

Tokyo, JP
Tokyo, Japan

Atago Co., Ltd.

Forward Citations = 63

21 inventors:

goldMedal Hideyuki Amamiya (21 out of 21 patents)

silverMedal Yoshiaki Torigoe (5 out of 5 patents)

bronzeMedal Masanosuke Tanaka (4 out of 4 patents)

4.  Yoshinori Nakashima (4 out of 4 patents)

5.  Kiminori Sekiguchi (3 out of 3 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Atago Co., Ltd.. Retrieved from https://idiyas.com/company/atago-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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