William C. Copenhafer
19Patents
12h-index
14Co-inventors
75Inventor score
Filing activity: Jan 29, 1980 → May 17, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5283054A | Process for producing sodium salts from brines of sodium ores | Chemistry; Metallurgy | 56 | Expired |
| US5262134A | Process for producing sodium salts from brines of sodium ores | Chemistry; Metallurgy | 47 | Expired |
| US4652054A | Solution mining of trona or nahcolite ore with electrodialytically-produced aqueous sodium hydroxide | Fixed Constructions | 41 | Expired |
| US6428759B1 | Production of feed liquors for sodium carbonate crystallization processes | Chemistry; Metallurgy | 39 | Expired |
| US4288419A | Enhanced recovery of sodium carbonate from NaCl-containing sodium carbonate solutions | Chemistry; Metallurgy | 28 | Expired |
| US6228335A | Process for the production of sodium carbonate crystals | Emerging Cross-Sectional Technologies | 21 | Expired |
| US4654204A | Production of sodium bicarbonate by reversion of soda-type feed salt | Chemistry; Metallurgy | 20 | Expired |
| US4283372A | Recovery of alkali values from sodium bicarbonate-containing ore with ammonia | Fixed Constructions | 19 | Expired |
| US4588569A | Dry injection flue gas desulfurization process using absorptive soda ash sorbent | Performing Operations; Transporting | 19 | Expired |
| US6576206B2 | Bicarbonate conversion in a carbonate monohydrate process | Chemistry; Metallurgy | 16 | Expired |
| US5194176A | Peroxygen laundry bleach | Chemistry; Metallurgy | 14 | Expired |
| US4519806A | Enhanced recovery of soda ash from aqueous sodium carbonate solutions containing Na.sub.2 SO.sub.4 - and NaCl | Chemistry; Metallurgy | 12 | Expired |
| US7998446B2 | Flue gas desulfurization process utilizing hydrogen peroxide | Emerging Cross-Sectional Technologies | 8 | Active |
| US7638109B2 | Production of sodium sesquicarbonate and sodium carbonate monohydrate | Chemistry; Metallurgy | 7 | Active |
| US6022516A | Method of reducing the formation of scale in the production of soda ash from trona and nahcolite ores | Chemistry; Metallurgy | 5 | Expired |
| US7018594B2 | Crystallization of sodium carbonate decahydrate from liquors supersaturated in sodium bicarbonate | Chemistry; Metallurgy | 3 | Expired |
| US4729881A | Hydrometallurgical process for the production of beryllium | Emerging Cross-Sectional Technologies | 2 | Expired |
| US8858902B2 | Selective removal of sulfide from aqueous alkali solutions | Chemistry; Metallurgy | 1 | Active |
| US8454840B1 | Selective removal of sulfide from aqueous alkali solutions | Chemistry; Metallurgy | 1 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.