Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4549934 | Flash zone draw tray for coker fractionator | Harlan G. Graf, George A. Kurdy | 1985-10-29 |
| 4541453 | High temperature slide valve | Harlan G. Graf, Don L. Edwards, Don D. Duren | 1985-09-17 |
| 4518487 | Process for improving product yields from delayed coking | Harlan G. Graf | 1985-05-21 |
| 4455219 | Method of reducing coke yield | Gary L. Poffenbarger | 1984-06-19 |
| 4344754 | Water cooled vertical gas distributor | Harlan G. Graf, Don L. Edwards | 1982-08-17 |