Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5162612 | Closure plate for covering opening of floor panels | Takehiko Okushima, Takao Okumura, Tatsuo Shoji, Tetsuo Tobikawa, Norio Nakamura | 1992-11-10 |
| 5072557 | Device for fixing floor panels | Norio Nakamura, Takehiko Okushima, Takao Okumura, Tatsuo Shoji, Tetsuo Tobikawa | 1991-12-17 |
| 4996804 | Device and structure for supporting floor panels | Takehiko Okushima, Takao Okumura, Tatsuo Shoji, Tetsuo Tobikawa | 1991-03-05 |
| 4922670 | Free access floor and method of constructing the same | Norio Nakamura, Takehiko Okushima, Takao Okumura, Tatsuo Shoji | 1990-05-08 |