Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4715146 | Apparatus for closing fireproof doors | Haruyuki Atsumi, Noboru Kasahara | 1987-12-29 |
| 4656690 | Fireproof door closer and holder having a solenoid and a toggle mechanism | Fujio Katagiri, Haruyuki Atsumi, Noboru Kasahara | 1987-04-14 |
| 4598494 | Apparatus for closing fireproof doors | Toshihide Tsuji, Yoshinori Ioka, Noboru Kasahara, Fujio Katagiri | 1986-07-08 |