Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4836362 | Endless drive transmission | — | 1989-06-06 |
| 4805473 | Bi-directional torque transmission unit | — | 1989-02-21 |
| 4765456 | Variable speed belt conveyor drive system | — | 1988-08-23 |
| 4564047 | Control valve | — | 1986-01-14 |
| 4311417 | Mine roof support | Arthur Scarfe, John Cambridge Smith | 1982-01-19 |
| 4310268 | Mining equipment | Arthur Scarfe | 1982-01-12 |
| 4226558 | Control system | Philip W. Dudley, John Cambridge Smith | 1980-10-07 |