Joseph E. Ritsko
42Patents
13h-index
26Co-inventors
77Inventor score
Filing activity: Sep 27, 1973 → Oct 10, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4731111A | Hydrometallurical process for producing finely divided spherical refractory metal based powders | Performing Operations; Transporting | 86 | Expired |
| US4731110A | Hydrometallurigcal process for producing finely divided spherical precious metal based powders | Performing Operations; Transporting | 42 | Expired |
| US4802915A | Process for producing finely divided spherical metal powders containing an iron group metal and a readily oxidizable metal | Performing Operations; Transporting | 42 | Expired |
| US4772315A | Hydrometallurgical process for producing finely divided spherical maraging steel powders containing readily oxidizable alloying elements | Performing Operations; Transporting | 40 | Expired |
| US4695439A | Yttrium oxide stabilized zirconium oxide | Chemistry; Metallurgy | 34 | Expired |
| US4859237A | Hydrometallurgical process for producing spherical maraging steel powders with readily oxidizable alloying elements | Performing Operations; Transporting | 33 | Expired |
| US5114471A | Hydrometallurgical process for producing finely divided spherical maraging steel powders | Performing Operations; Transporting | 31 | Expired |
| US4787934A | Hydrometallurgical process for producing spherical maraging steel powders utilizing spherical powder and elemental oxidizable species | Performing Operations; Transporting | 29 | Expired |
| US4348224A | Method for producing cobalt metal powder | Emerging Cross-Sectional Technologies | 24 | Expired |
| US4233063A | Process for producing cobalt powder | Performing Operations; Transporting | 21 | Expired |
| US4070184A | Process for producing refractory carbide grade powder | Chemistry; Metallurgy | 20 | Expired |
| US3973948A | Free flowing powder and process for producing it | Performing Operations; Transporting | 15 | Expired |
| US4948527A | Method of making europium activated yttrium oxide phosphor | Chemistry; Metallurgy | 14 | Expired |
| US4913731A | Process of making prealloyed tungsten alloy powders | Performing Operations; Transporting | 13 | Expired |
| US4214895A | Method for producing cobalt metal powder | Chemistry; Metallurgy | 13 | Expired |
| US4927456A | Hydrometallurgical process for producing finely divided iron based powders | Performing Operations; Transporting | 13 | Expired |
| US3956474A | Process for producing ammonium metatungstate from ammonium tungstate by digestion in silica | Chemistry; Metallurgy | 10 | Expired |
| US4214894A | Method for producing cobalt metal powder | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4490340A | Process for the recovery of high purity tantalum oxide | Chemistry; Metallurgy | 9 | Expired |
| US4537750A | Process for producing high purity tantalum oxide | Chemistry; Metallurgy | 9 | Expired |
| US4184868A | Method for producing extra fine cobalt metal powder | Chemistry; Metallurgy | 8 | Expired |
| US4900590A | Method for producing aluminum oxide coated iron powder | Chemistry; Metallurgy | 8 | Expired |
| US4495158A | Process for the recovery of tantalum values | Chemistry; Metallurgy | 6 | Expired |
| US4028095A | Free flowing powder and process for producing it | Chemistry; Metallurgy | 5 | Expired |
| US4723993A | Hydrometallurgical process for producing finely divided spherical low melting temperature metal based powders | Emerging Cross-Sectional Technologies | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.