Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4466883 | Needle coke process and product | Daniel B. Eickemeyer, Gerald E. Tollefsen | 1984-08-21 |
| 4263127 | White oil process | Daniel B. Eickemeyer, Gerald E. Tollefsen | 1981-04-21 |
| 4251347 | White mineral oil made by two stage hydrogenation | Henry Erickson, by Doris Erickson, executor, Gerald E. Tollefsen, Thomas W. Kelly | 1981-02-17 |