| 2552866 | Manufacture of water gas | |||
| 2237339 | Apparatus for cracking hydrocarbons | |||
| 1941809 | Art of hydrogenating and distilling oil shale | |||
| 1924856 | Continuous gas manufacture | |||
| 1913340 | Activating carbon | |||
| 1901170 | Gasification of carbonaceous material | |||
| 1883218 | Method of and apparatus for pulverizing and treating material | |||
| 1843063 | N/A | |||
| 1811195 | Method of treating petroleum oil | |||
| 1039398 | N/A |
| GB168581A |