Issued Patents All Time
Showing 1–17 of 17 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4671801 | Method for the beneficiation, liquefaction and recovery of coal and other solid carbonaceous materials | Lester E. Burgess, Robert Hagstrom, David E. Herman | 1987-06-09 |
| 4650567 | Apparatus and method for flotation separation utilizing an improved spiral spray nozzle | David E. Herman, Robert A. Treskot, David C. Fistner, Sr. | 1987-03-17 |
| 4632750 | Process for coal beneficiation by froth flotation employing pretreated water | — | 1986-12-30 |
| 4605420 | Method for the beneficiation of oxidized coal | David E. Herman, Robert A. Treskot, David C. Fistner, Sr. | 1986-08-12 |
| 4605494 | Multistream, multiproduct, pressure manipulation beneficiation arrangement | Lester E. Burgess, David E. Herman | 1986-08-12 |
| 4597858 | Multistream, multiproduct beneficiation arrangement | Lester E. Burgess, David E. Herman | 1986-07-01 |
| 4583990 | Method for the beneficiation of low rank coal | David E. Herman | 1986-04-22 |
| 4564369 | Apparatus for the enhanced separation of impurities from coal | Lester E. Burgess, Karl M. Fox, David E. Herman | 1986-01-14 |
| 4536372 | Apparatus for beneficiating coal | Lester E. Burgess, Karl M. Fox, David E. Herman | 1985-08-20 |
| 4526585 | Beneficiated coal, coal mixtures and processes for the production thereof | Lester E. Burgess, Karl M. Fox | 1985-07-02 |
| 4514291 | Apparatus and method for flotation separation utilizing an improved spiral spray nozzle | David E. Herman, Robert A. Treskot, David C. Fistner, Sr. | 1985-04-30 |
| 4412843 | Beneficiated coal, coal mixtures and processes for the production thereof | Lester E. Burgess, Karl M. Fox | 1983-11-01 |
| 4406664 | Process for the enhanced separation of impurities from coal and coal products produced therefrom | Lester E. Burgess, Karl M. Fox, David E. Herman | 1983-09-27 |
| 4347126 | Apparatus and method for flotation separation utilizing a spray nozzle | David E. Herman | 1982-08-31 |
| 4332593 | Process for beneficiating coal | Lester E. Burgess, Karl M. Fox, David E. Herman | 1982-06-01 |
| 4304573 | Process of beneficiating coal and product | Lester E. Burgess, Karl M. Fox | 1981-12-08 |
| 4253614 | Flotation of non-sulfide zinc materials | Zoran Pacic | 1981-03-03 |