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USPTO Patent Rankings Data through Sept 30, 2025
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Tomoyasu Umeno — 4 Patents

KOKonica: 4 patents #638 of 1,958Top 35%
Overall (All Time): #1,279,382 of 4,157,543Top 35%
4 Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
6051352 Carrier for developing electrostatic image, developer and developing method Ryuji Kitani, Tatsuya Nagase, Meizo Shirose 2000-04-18
5932388 Carrier for developing electrostatic image, developer and developing method Meizo Shirose, Tatsuya Nagase, Ryuji Kitani 1999-08-03
5733692 Toner kit for electrophotography Tatsuya Nagase, Ryuji Kitani, Meizo Shirose 1998-03-31
5376488 Carrier for electrostatic image developer and process for the production thereof Ken Ohmura, Shigenori Kouno 1994-12-27