Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12317987 | Shoulder belt and bag | Yuki Yamada, Tetsuya Kanayama | 2025-06-03 |
| 11738242 | Wave sole for a golf club head | David Llewellyn, Kei Tsuji | 2023-08-29 |
| 10926141 | Wave sole for a golf club head | David Llewellyn, Kei Tsuji | 2021-02-23 |
| 10357696 | Golf club head and golf club | Kazuhiro Doi | 2019-07-23 |
| D650876 | Hybrid-type golf club head | David Llewellyn, Kazuya Ishida, Tetsu Kanayama | 2011-12-20 |
| D650877 | Iron-type golf club head | David Llewellyn, Isamu Toshinari | 2011-12-20 |
| D641821 | Iron-type golf club head | David Llewellyn, Isamu Toshinari | 2011-07-19 |
| D639363 | Wood-type golf club | David Llewellyn, Tetsuya Kanayama | 2011-06-07 |