Issued Patents 1989
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885028 | Process for producing prealloyed tungsten alloy powders | Walter A. Johnson, Jack E. Vanderpool, Howard H. Shaw | 1989-12-05 |
| 4880605 | Gas dispersion shroud for high temperature processing of powders | Philip E. Stermer, Lori S. Pruyne | 1989-11-14 |
| 4859237 | Hydrometallurgical process for producing spherical maraging steel powders with readily oxidizable alloying elements | Walter A. Johnson, Joseph E. Ritsko | 1989-08-22 |
| 4816067 | Process for producing fine spherical particles | Jack E. Vanderpool | 1989-03-28 |
| 4808217 | Process for producing fine spherical particles having a low oxygen content | Lori S. Pruyne | 1989-02-28 |
| 4802915 | Process for producing finely divided spherical metal powders containing an iron group metal and a readily oxidizable metal | Joseph E. Ritsko, Walter A. Johnson | 1989-02-07 |
| 4800064 | Process for producing tungsten heavy alloy sheet using hydrometallurgically produced tungsten heavy alloy | Preston B. Kemp, Jr., Walter A. Johnson | 1989-01-24 |