Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4976781 | Mineral recovery process | David Mainwaring | 1990-12-11 |
| 4585548 | Recovery of metal values from mineral ores by incorporation in coal-oil agglomerates | Graham J. Elkes, Gavin J. Ewin, David Mainwaring | 1986-04-29 |