Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4988210 | Method and apparatus for detecting defective portion on outer surface of pipe | Koji Ishihara, Toru Hirashima, Shunichiro Ishida, Haruhito Okamoto, Yuji Matoba | 1991-01-29 |
| 4983836 | Method for detecting thinned out portion on inner surface or outer surface of pipe | Yuji Matoba | 1991-01-08 |
| 4886370 | Method for detecting a state of substance existing in pipe | Rokurou Misawa, Yuzo Sagawa, Kimio Takehara | 1989-12-12 |
| 4872762 | Method and apparatus for detecting defective portion on inner surface of pipe | Rokurou Misawa, Yuzo Sagawa, Kimio Takehara, Yuji Matoba, Koji Ishihara | 1989-10-10 |