Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5228526 | Overflow valve of drill string | Andrei N. Vshivkov, Anatoly M. Kochnev, Gennady A. Schelkonogov, Vladimir B. Goldobin | 1993-07-20 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5228526 | Overflow valve of drill string | Andrei N. Vshivkov, Anatoly M. Kochnev, Gennady A. Schelkonogov, Vladimir B. Goldobin | 1993-07-20 |