Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9597563 | Multi-track adjustable golf club | David Llewellyn, Kazuya Ishida, Tetsuya Kanayama, Kei Tsuji | 2017-03-21 |
| D736873 | Iron-type golf club head | Kazuhiro Doi, Tsugunobu Sakamoto | 2015-08-18 |
| D720027 | Iron-type golf club head | Kazuhiro Doi, Tsugunobu Sakamoto | 2014-12-23 |
| D682960 | Iron-type golf club head | Kazuhiko Natori | 2013-05-21 |
| D682377 | Iron-type golf club head | Richard Delvac | 2013-05-14 |
| D672830 | Iron-type golf club | Richard Delvac, Kazuhiko Natori | 2012-12-18 |
| D660389 | Iron-type golf club | Richard Delvac, Mamoru Saraie | 2012-05-22 |
| D629061 | Iron-type golf club | David Llewellyn, Kazuhiro Doi, Tsugunobu Sakamoto | 2010-12-14 |
| D619183 | Back design for iron golf club heads | David Llewellyn, Kazuhiro Doi | 2010-07-06 |
| D606606 | Back design for an iron golf club head | David Llewellyn, Kazuhiro Doi | 2009-12-22 |
| 7517286 | Trial golf club for measuring loft angle and methods for using the same | Masao Nagai, Bill Price, David Llewellyn, Richard Delvac | 2009-04-14 |