Issued Patents All Time
Showing 25 most recent of 37 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5114471 | Hydrometallurgical process for producing finely divided spherical maraging steel powders | Walter A. Johnson, Nelson E. Kopatz | 1992-05-19 |
| 5102454 | Hydrometallurgical process for producing irregular shaped powders with readily oxidizable alloying elements | Walter A. Johnson, Nelson E. Kopatz | 1992-04-07 |
| 5000785 | Method for controlling the oxygen content in agglomerated molybdenum powders | David J. Port | 1991-03-19 |
| 4966760 | Method for recovering chromium from chromium-bearing material | Judith A. Ladd | 1990-10-30 |
| 4948527 | Method of making europium activated yttrium oxide phosphor | Anthony F. Kasenga, Scott A. Renninger | 1990-08-14 |
| 4927456 | Hydrometallurgical process for producing finely divided iron based powders | Nelson E. Kopatz, Walter A. Johnson | 1990-05-22 |
| 4913731 | Process of making prealloyed tungsten alloy powders | Nelson E. Kopatz, Walter A. Johnson | 1990-04-03 |
| 4900590 | Method for producing aluminum oxide coated iron powder | Walter A. Johnson, Nelson E. Kopatz | 1990-02-13 |
| 4900587 | Method for producing aluminum oxide coated iron-aluminum alloy powder | Walter A. Johnson, Nelson E. Kopatz | 1990-02-13 |
| 4898749 | Method for producing aluminum oxide coated cobalt powder | Walter A. Johnson, Nelson E. Kopatz | 1990-02-06 |
| 4859237 | Hydrometallurgical process for producing spherical maraging steel powders with readily oxidizable alloying elements | Walter A. Johnson, Nelson E. Kopatz | 1989-08-22 |
| 4859236 | Process for producing molybdenum-ruthenium metal powder | Thomas J. Patrician, Harry D. Martin, III | 1989-08-22 |
| 4802915 | Process for producing finely divided spherical metal powders containing an iron group metal and a readily oxidizable metal | Nelson E. Kopatz, Walter A. Johnson | 1989-02-07 |
| 4801472 | Process for coating tungsten carbide with cobalt metal | Jen S. Lee | 1989-01-31 |
| 4792351 | Hydrometallurgical process for producing irregular morphology powders | Walter A. Johnson, Nelson E. Kopatz | 1988-12-20 |
| 4787934 | Hydrometallurgical process for producing spherical maraging steel powders utilizing spherical powder and elemental oxidizable species | Walter A. Johnson, Nelson E. Kopatz | 1988-11-29 |
| 4772315 | Hydrometallurgical process for producing finely divided spherical maraging steel powders containing readily oxidizable alloying elements | Walter A. Johnson, Nelson E. Kopatz | 1988-09-20 |
| 4731110 | Hydrometallurigcal process for producing finely divided spherical precious metal based powders | Nelson E. Kopatz, Walter A. Johnson | 1988-03-15 |
| 4731111 | Hydrometallurical process for producing finely divided spherical refractory metal based powders | Nelson E. Kopatz, Walter A. Johnson | 1988-03-15 |
| 4723993 | Hydrometallurgical process for producing finely divided spherical low melting temperature metal based powders | Nelson E. Kopatz, Walter A. Johnson | 1988-02-09 |
| 4710368 | High purity high surface area alpha crystalline silicon nitride | Howard L. Acla | 1987-12-01 |
| 4695439 | Yttrium oxide stabilized zirconium oxide | David L. Houck, Howard L. Acla | 1987-09-22 |
| 4684400 | Method for controlling the oxygen content in agglomerated molybdenum powders | David J. Port, David L. Houck | 1987-08-04 |
| 4626422 | High purity high surface area silicon nitride | Howard L. Acla | 1986-12-02 |
| 4578251 | Removal of chromium from cobalt | Howard L. Acla | 1986-03-25 |