Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5339868 | Bent pipe having sectional form of high strength | Hisashi Naoi, Tetsuo Nagasaka, Yoichi Matsubara, Masaaki Takagishi, Seiichi Akizawa | 1994-08-23 |
| 4377302 | Threaded joint with high gas-leak-tightness for oil and gas well pipe | Fuzimasa Kohyama, Sigeyuki Akase | 1983-03-22 |