Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4404180 | Manufacture of hydrogen sulfide | Ian Drum, Richard S. Madenburg, Douglas M. Paulsrude, Frank G. Turpin, Gerry A. Wheatcroft | 1983-09-13 |
| 4332774 | Manufacture of hydrogen sulfide | Ian Drum, Richard S. Madenburg, Douglas M. Paulsrude, Frank G. Turpin, Gerry A. Wheatcroft | 1982-06-01 |