Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Ryoei WATANABE — 4 Patents

DCDowa Eco-System Co.: 2 patents #4 of 12Top 35%
DCDowa Holdings Co.: 1 patents #27 of 77Top 40%
TUThe Jikei University: 1 patents #7 of 34Top 25%
Tokyo, JP: #30,468 of 90,295 inventorsTop 35%
Overall (All Time): #1,080,739 of 4,157,543Top 30%
4 Patents All Time
Ryoei WATANABE has been granted 4 US patents while listed as an inventor at Dowa Eco-System Co.. The first was granted in 2016 and the most recent in December 2025. Ryoei WATANABE ranks #1,080,739 of 4,157,543 US inventors in our database (top 26.0%). Patent records list Ryoei WATANABE in Tokyo, JP.

Patents per Year

Patents granted per year, 2016 to 2025Bar chart with a peak of 2 patents in 2025.peak 22016: 1 patents20162019: 1 patents20192025: 2 patents2025

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
12503747 Method for separating lithium Chihiro NISHIKAWA, Yoshihiro Honma 2025-12-23
12303912 Separation method for valuable resources Tatsuya YODOSE, Hitoshi Sasaki, Chihiro NISHIKAWA, Yoshihiro Honma 2025-05-20
10233099 Radioactive cesium decontaminator and method of producing the same, and method of removing the radioactive cesium Yoshihisa Namiki, Toshihiko Ueyama, Takayuki Yoshida 2019-03-19
9359659 Method for recovering valuable material from lithium-ion secondary battery, and recovered material containing valuable material Koji Fujita, Satoshi Kawakami, Yoshihiro Honma 2016-06-07

Frequent Collaborators

Yoshihiro Honma3 shared
Chihiro NISHIKAWA2 shared
Yoshihisa Namiki1 shared
Satoshi Kawakami1 shared
Tatsuya YODOSE1 shared
Takayuki Yoshida1 shared

Nearby-Ranked Inventors

Jagadeesh Kandasamy4
Ross CABOT4
George Ueda4
Franz A. Gruswitz4
Tommy Glimberg4
Vinayakaraddy Gulabal4
Sandra Bittorf4
Aviel FOGEL4
Eric Matthew Walton4