Issued Patents All Time
Showing 25 most recent of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6623807 | Stabilization of color in heated electroluminescent phosphor | Richard G. W. Gingerich | 2003-09-23 |
| 6395196 | Process for producing electroluminescent phosphor with extended half-life | Richard G. W. Gingerich | 2002-05-28 |
| 6113808 | Electroluminescent phosphor with extended life and method of making same | Richard G. W. Gingerich | 2000-09-05 |
| 5932184 | Method for recovery of tungsten from spent catalysts | Michael J. Miller | 1999-08-03 |
| 5788938 | Recovery of tungsten from ferrotungsten | Jia-Ming Chern, Thomas A. Wolfe, Michael J. Miller | 1998-08-04 |
| 5417945 | Process for recovering tungsten as an ammoniacal tungstate compound in which ammoniacal tungstate liquors are reclaimed | Richard G. W. Gingerich, James N. Christini, Martin Vogt, Michael J. Miller | 1995-05-23 |
| 5021133 | Electrolytic method for producing ammonium paratungstate from cemented tungsten carbide | Tai K. Kim | 1991-06-04 |
| 5015458 | Method for purifying sulfuric acid solutions | Timothy J. Hoffman | 1991-05-14 |
| 5009788 | Method for removing organic and tungsten from sodium sulfate solution | Tai K. Kim | 1991-04-23 |
| 4961910 | Recovery of tungsten and molybdenum | John Powers, III | 1990-10-09 |
| 4816069 | Method for converting cobalt to cobalt metal powder | Alan D. Douglas, Martin B. MacInnis | 1989-03-28 |
| 4808384 | Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material | Judith A. Ladd, Martin B. MacInnis, Mary A. Fedorchak | 1989-02-28 |
| 4804407 | Method for recovering cobalt from hexammine cobaltic (111) solutions | Richard A. Scheithauer, Michael J. Miller | 1989-02-14 |
| 4741886 | Process for recovering tungsten from tungsten bearing material containing arsenic | Richard A. Scheithauer, Martin B. MacInnis | 1988-05-03 |
| 4718996 | Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material | Martin B. McInnis, Judith A. Ladd | 1988-01-12 |
| 4718995 | Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material | Martin B. MacInnis, Judith A. Ladd | 1988-01-12 |
| 4690710 | Process for producing cobalt metal powder | Richard A. Scheithauer, Michael J. Miller, Richard G. W. Gingerich | 1987-09-01 |
| 4684401 | Chromium-cobalt fine alloy powder and process for producing same | Judith A. Ladd | 1987-08-04 |
| 4676965 | Process for producing high purity silicon nitride | — | 1987-06-30 |
| 4668483 | Process for recovery of chromium | Judith A. Ladd | 1987-05-26 |
| 4626425 | Recovery of tungsten from ammoniacal solutions | Richard A. Scheithauer, Martin B. MacInnis, Michael J. Miller | 1986-12-02 |
| 4626280 | Recovery of tungsten, scandium, iron, and manganese from tungsten bearing material | Martin B. MacInnis, Judith A. Ladd | 1986-12-02 |
| 4624703 | Recovery of tungsten, scandium, iron, and manganese values from tungsten bearing material | Martin B. MacInnis, Judith A. Ladd | 1986-11-25 |
| 4624844 | Process for producing ammonium paratungstate | Richard A. Scheithauer, Martin B. MacInnis, Michael J. Miller | 1986-11-25 |
| 4623534 | Method for producing ammonium paratungstate | Richard A. Scheithauer, Michael J. Miller | 1986-11-18 |