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For the Inventor, By the Inventor

Tokyo, Japan

Sumitomo Metal Mining Company, Ltd.

Calculating rank
USPTO Granted Patents = 898

% Expired Patents = 22.7



Trademarks = 5

Forward Citations = 2,760

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744 inventors (with patents filed for the assignee):

goldMedal Kazuomi Ryoshi (54 out of 54 patents)

silverMedal Masaya Yukinobu (48 out of 48 patents)

bronzeMedal Yoshiyuki Abe (44 out of 66 patents)

4.  Hiroyuki Toya (40 out of 40 patents)

5.  Tokuyuki Nakayama (38 out of 39 patents)

6.  Kensaku Mori (37 out of 59 patents)

7.  Yoshitomo Ozaki (35 out of 35 patents)

8.  Hiroshi Kobayashi (34 out of 39 patents)

9.  Tetsufumi Komukai (32 out of 32 patents)

10.  Haruki Kaneda (28 out of 31 patents)

11.  Satoshi Asano (28 out of 33 patents)

12.  Osamu Nakai (27 out of 28 patents)

13.  Takeshi Chonan (26 out of 32 patents)

14.  Hirofumi Tsunematsu (23 out of 28 patents)

15.  Kenji Adachi (23 out of 49 patents)


Core Competencies:
Lithium Ion Battery
Positive Electrode
Active Material
Nonaqueous Electrolyte
Composite Hydroxide
Production Method
Electrode Manufacturing
Metal Recovery
High-Temperature Operation
Slurry Processing
Infrared Absorbing Material
Nickel Cobalt Alloy

898 patents:

1. 12500283 - Method for treating alloy (2025-12-16),
2. 12500233 - Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery (2025-12-16),
3. 12494482 - Lithium metal composite oxide powder, positive electrode active material for lithium secondary batteries, positive electrode, and lithium secondary battery (2025-12-09),
4. 12473208 - Production method and production apparatus for nickel sulfate solution (2025-11-18),
5. 12465899 - Slurry processing apparatus, microbubble generation equipment, and slurry processing method (2025-11-11),
6. 12464952 - Magnetostrictive member and method for manufacturing magnetostrictive member (2025-11-04),
7. 12454465 - Nickel manganese cobalt composite hydroxide, method for producing nickel manganese cobalt composite hydroxide, lithium nickel manganese cobalt composite oxide, and lithium ion secondary battery (2025-10-28),
8. 12451483 - Metal composite hydroxide and method for producing same, positive electrode active material for non-aqueous electrolyte secondary battery and method for producing same, and non-aqueous electrolyte secondary battery (2025-10-21),
9. 12448325 - Optical film, sputtering target, and method of producing optical film (2025-10-21),
10. 12444740 - Cathode active material for lithium ion secondary battery and method for producing same (2025-10-14),
11. 12435223 - Dark powder dispersion liquid, dark powder dispersion body and colored layer-attached base material (2025-10-07),
12. 12431494 - Nickel manganese cobalt composite hydroxide, method for producing nickel manganese cobalt composite hydroxide, lithium nickel manganese cobalt composite oxide, and lithium ion secondary battery (2025-09-30),
13. 12418041 - Positive electrode active material for non-aqueous electrolyte secondary battery and method for manufacturing the same, positive electrode mixed material paste for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery (2025-09-16),
14. 12394794 - Positive electrode active material, high-temperature operation type lithium-ion polymer secondary battery, high-temperature operation type lithium ion inorganic all-solid-state secondary battery (2025-08-19),
15. 12388111 - Nonaqueous electrolyte secondary battery positive electrode active material and method for manufacturing same, and nonaqueous electrolyte secondary battery (2025-08-12),
Company Overview
Sumitomo Metal Mining Company, Ltd., headquartered in Tokyo, Japan, is a leader in the development and manufacturing of advanced materials for lithium-ion batteries. The company specializes in core technologies such as positive electrodes, active materials, and nonaqueous electrolytes, contributing significantly to the energy storage sector. With a strong focus on innovation, Sumitomo Metal Mining is dedicated to enhancing battery performance through its expertise in composite hydroxides and electrode manufacturing, while also engaging in sustainable metal recovery practices.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

Sumitomo Metal Mining Company, Ltd. USPTO Patent Assignee Logo
898 Patents

#123 in Tokyo

#247 in Japan

#1,136 in the World

Tokyo, JP
Tokyo, Japan

Sumitomo Metal Mining Company, Ltd.

Forward Citations = 2,760

744 inventors:

goldMedal Kazuomi Ryoshi (54 out of 54 patents)

silverMedal Masaya Yukinobu (48 out of 48 patents)

bronzeMedal Yoshiyuki Abe (44 out of 66 patents)

4.  Hiroyuki Toya (40 out of 40 patents)

5.  Tokuyuki Nakayama (38 out of 39 patents)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Sumitomo Metal Mining Company, Ltd.. Retrieved from https://idiyas.com/company/sumitomo-metal-mining-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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