Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8202027 | Water treatment pad for drilling tool | Yoshiyuki Takano | 2012-06-19 |
| 7703552 | Water treatment pad for core drill | — | 2010-04-27 |
| 4656690 | Fireproof door closer and holder having a solenoid and a toggle mechanism | Haruyuki Atsumi, Hisatugu Anzai, Noboru Kasahara | 1987-04-14 |
| 4598494 | Apparatus for closing fireproof doors | Toshihide Tsuji, Yoshinori Ioka, Hisatugu Anzai, Noboru Kasahara | 1986-07-08 |