Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5577528 | Apparatus for upgrade or repair of in-service pipelines | Narayan C. Saha, Chi Lei | 1996-11-26 |
| 5269340 | Combined hot tap pipe cutter and gate valve for plastic pipe | — | 1993-12-14 |