| 2397142 | Filter | |||
| 2368261 | Method of removing dye and tetraethyl lead from gasoline | |||
| 1962153 | Fractional distillation | |||
| 1676724 | Art of distillation | |||
| 1604235 | Process for removing sulphur compounds from petroleum oils | |||
| 1594296 | Apparatus for distilling oils | |||
| 0944456 | N/A | |||
| 0666785 | N/A | |||
| 0646558 | N/A |
| GB312200A | ||||
| FR728741A |