Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7077945 | Cu—Ni—Fe anode for use in aluminum producing electrolytic cell | S. Craig Bergsma, Donald R Bradford, Robert J. Barnett, Michael B. Mezner | 2006-07-18 |
| 6723222 | Cu-Ni-Fe anodes having improved microstructure | S. Craig Bergsma | 2004-04-20 |
| 6719890 | Cathode for a hall-heroult type electrolytic cell for producing aluminum | — | 2004-04-13 |
| 6719889 | Cathode for aluminum producing electrolytic cell | — | 2004-04-13 |
| 6497807 | Electrolyte treatment for aluminum reduction | Richard J. Brooks, Patrick B. Frizzle, Drago D. Juric | 2002-12-24 |
| 6485628 | Bath for electrolytic reduction of alumina and method therefor | Richard J. Brooks, Patrick B. Frizzle, Drago D. Juric | 2002-11-26 |
| 6436272 | Low temperature aluminum reduction cell using hollow cathode | Patrick B. Frizzle | 2002-08-20 |
| 6419812 | Aluminum low temperature smelting cell metal collection | Theodore R. Beck | 2002-07-16 |
| 6419813 | Cathode connector for aluminum low temperature smelting cell | Theodore R. Beck, Patrick B. Frizzle | 2002-07-16 |
| 6379512 | Combination for electrolytic reduction of alumina | Richard J. Brooks, Patrick B. Frizzle, Drago D. Juric | 2002-04-30 |
| 6359393 | Dimmer for a gas discharge lamp employing frequency shifting | — | 2002-03-19 |
| 6258247 | Bath for electrolytic reduction of alumina and method therefor | Richard J. Brooks, Patrick B. Frizzle, Drago D. Juric | 2001-07-10 |
| 5990634 | Dynamic range dimmer for gas discharge lamps | — | 1999-11-23 |
| 5731873 | Fluorescent spectrophotometer system with automatic calibration and improved optics block | Paul Danilchik | 1998-03-24 |
| 5155672 | Switched multi-tapped transformer power conversion method and apparatus | — | 1992-10-13 |