Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 4817786 | Drive arrangement for tramming conveyor | Thomas W. McCormick | 1989-04-04 | $9,948,000 |
| 4798279 | Mine haulage method and apparatus | Margaret A. Roberts, Harry J. Brown | 1989-01-17 | $10,441,000 |
| 4784257 | Conveyor system including a re-railer | — | 1988-11-15 | $11,445,000 |
| 4773520 | Steering apparatus for a tramming conveyor | John B. Riester | 1988-09-27 | $10,212,000 |
| 4611955 | Slurry pump tram control apparatus | — | 1986-09-16 | |
| 4553881 | Slurry pump tram control apparatus | — | 1985-11-19 | |
| 4415207 | Underspoil slurry haulage | — | 1983-11-15 | |
| 4381161 | Slurry recovery from a circular sump | Hilbert D. Dahl, Ronald W. Umphrey | 1983-04-26 | |
| 4359298 | Method and apparatus for the filling of a slurry sump | Frederick A. Webb | 1982-11-16 | |
| 4286822 | Underspoil slurry haulage | — | 1981-09-01 | $25,443,000 |