Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4710368 | High purity high surface area alpha crystalline silicon nitride | Joseph E. Ritsko | 1987-12-01 |
| 4695439 | Yttrium oxide stabilized zirconium oxide | Joseph E. Ritsko, David L. Houck | 1987-09-22 |
| 4626422 | High purity high surface area silicon nitride | Joseph E. Ritsko | 1986-12-02 |
| 4578251 | Removal of chromium from cobalt | Joseph E. Ritsko | 1986-03-25 |
| 4537750 | Process for producing high purity tantalum oxide | Joseph E. Ritsko | 1985-08-27 |
| 4495158 | Process for the recovery of tantalum values | Joseph E. Ritsko | 1985-01-22 |
| 4490340 | Process for the recovery of high purity tantalum oxide | Joseph E. Ritsko | 1984-12-25 |
| 4482526 | Recovery of tungsten and molybdenum from sulfur-bearing material | Joseph E. Ritsko | 1984-11-13 |
| 4255397 | Process for removing tungsten from cemented tungsten carbide | Brice E. Martin, Joseph E. Ritsko | 1981-03-10 |
| 4233063 | Process for producing cobalt powder | Joseph E. Ritsko, John J. Culkin, Martin B. MacInnis | 1980-11-11 |
| 4214894 | Method for producing cobalt metal powder | Joseph E. Ritsko, Richard G. W. Gingerich | 1980-07-29 |
| 4184868 | Method for producing extra fine cobalt metal powder | Joseph E. Ritsko, Clarence D. Vanderpool, William Scheithauer, Jr., Geoffrey L. Harris | 1980-01-22 |