Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5364110 | Downhole tool metal-to-metal seal | John T. Brandell, David D. Szarka, Bobby L. Sullaway | 1994-11-15 |
| 5314015 | Stage cementer and inflation packer apparatus | John T. Brandell, Richard L. Giroux, Lee W. Stepp | 1994-05-24 |
| 5299640 | Knife gate valve stage cementer | John T. Brandell, Charles F. VanBerg, Jr. | 1994-04-05 |