Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4889958 | Building with electromagnetic shield structure for individual floors | Takeshi Takahashi, Yoshiji Yabana, Toshiuyki Ishikawa, Koji Nagata | 1989-12-26 |
| 4814694 | System for detecting and processing abnormality in electromagnetic shielding of intelligent buildings | Takeshi Takahashi, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata | 1989-03-21 |
| 4810961 | Radio wave leakage diagnosing system for intelligent building | Takeshi Takahashi, Yoshiji Yabana, Toshiyuki Ishikawa, Koji Nagata | 1989-03-07 |