Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12343778 | Die for ironing working and die module | Takuho KUMAGAI, Ryozo Shiroishi, Masahiro Shimamura, Naoya Matsumoto | 2025-07-01 |
| 12157602 | Aluminum can | Norihisa Hirota, Ryozo Shiroishi, Takuho KUMAGAI | 2024-12-03 |
| 11338954 | Aluminum can | Norihisa Hirota, Ryozo Shiroishi, Takuho KUMAGAI | 2022-05-24 |
| 11267033 | Mold and method for manufacturing drawn can | Ryozo Shiroishi, Takuho KUMAGAI | 2022-03-08 |
| 10155293 | Diamond surface polishing method and apparatus for implementing same | Masahiro Shimamura, Ryozo Shiroishi | 2018-12-18 |
| 9630372 | Method of producing pressed paper piece and apparatus therefor | Ichiro Kunihiro, Masahiro Ogawa, Seiji Okabe | 2017-04-25 |
| 9149901 | Method of polishing the diamond-surface | Ryozo Shiroishi | 2015-10-06 |