Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE39509 | Top entry sub arrangement | Charles M. Helms | 2007-03-13 |
| 5284210 | Top entry sub arrangement | Charles M. Helms | 1994-02-08 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE39509 | Top entry sub arrangement | Charles M. Helms | 2007-03-13 |
| 5284210 | Top entry sub arrangement | Charles M. Helms | 1994-02-08 |