Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5396953 | Positive circulating valve with retrievable standing valve | Barry Kent Holder, Steven L. Schwegman | 1995-03-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5396953 | Positive circulating valve with retrievable standing valve | Barry Kent Holder, Steven L. Schwegman | 1995-03-14 |