Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6109305 | Double walled pipe, jacking method and pipe end structure of leading pipe | Tomoya Fujimoto, Kenko Okamura, Shigeru Morishita, Masaru Murakami, Akira Adachi +4 more | 2000-08-29 |
| 6004073 | Double walled pipe, jacking method and pipe end structure of leading pipe | Tomoya Fujimoto, Kenko Okamura, Shigeru Morishita, Masaru Murakami, Akira Adachi +4 more | 1999-12-21 |
| 5615976 | Double walled pipe, jacking method and pipe end structure of leading pipe | Tomoya Fujimoto, Kenko Okamura, Shigeru Morishita, Masaru Murakami, Akira Adachi +4 more | 1997-04-01 |
| 5527135 | Method for injecting lubricant or back-filling material into a space between the outside of double-wall pipes and the ground in the pipe-jacking method and an apparatus therefor | Mitsutoshi Hayashi, Akitaka Fujita, Shingo Nagashima, Makoto Kajiyama, Hideki Uno | 1996-06-18 |
| 5484232 | Method for injecting lubricant and filler in the pipe-jacking method | Mitsutoshi Hayashi, Akitaka Fujita, Shingo Nagashina, Makoto Kajiyama, Hideki Uno | 1996-01-16 |