Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7186060 | Method and device for lining construction in sewer followed by simultaneous filling of back-fill material | Eiki Akimoto, Hiroshi Sugahara, Yuzo Yokoyama, Akira Imagawa, Naoki Kitahashi +1 more | 2007-03-06 |
| 6234226 | Apparatus for lining an inner face of tubular culverts having arbitrary cross section | Naoki Kitahashi, Yasushi Kitayama, Eiki Akimoto | 2001-05-22 |
| 5799701 | Method of and an apparatus for lining a pipeline | Naoki Kitahashi, Yasushi Kitayama, Eiki Akimoto | 1998-09-01 |