|
| US4686032 | 10 avr. 1985 | 11 août 1987 | Electro Minerals (Canada), Inc. | Automatic method for separating and cleaning silicon carbide furnace materials |
| US4810368 | 28 mai 1987 | 7 mars 1989 | Electro Minerals (Canada) Inc. | Automatic method for separating and cleaning silicon carbide furnace materials |
| USRE30360 | 14 déc. 1977 | 5 août 1980 | Maryland Patent Development Co., Inc. | Magnetic separation of particulate mixtures |