Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4273190 | Method and apparatus for gravel packing multiple zones | Eugene E. Baker, David D. Szarka, Nolan M. Workman | 1981-06-16 |
| 4270608 | Method and apparatus for gravel packing multiple zones | James D. Hendrickson, Pat M. White, Nolan M. Workman, Eugene E. Baker, David D. Szarka | 1981-06-02 |