Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7805986 | Portable vehicle exhaust flow sensor | Alex D. Colvin, James W. Butler | 2010-10-05 |
| 7568383 | Portable vehicle exhaust flow sensor | Alex D. Colvin, James W. Butler | 2009-08-04 |
| 5803156 | Method of making catalyst cured resin-coated sand cores | Elaine C. Beckwith, James Stewart Rankin, II | 1998-09-08 |
| 5794596 | Method and system for predictably controlling air/fuel ratio | James W. Butler, Alex D. Colvin | 1998-08-18 |
| 5138163 | Direct sampling of engine emissions for instantaneous analysis | James W. Butler, Alex D. Colvin | 1992-08-11 |
| 4950476 | Method of catalytically oxidizing alcohol vapor accompanied by varying amounts of excess oxygen | Eugene C. Su, William L. H. Watkins, Haren S. Gandhi | 1990-08-21 |
| 4928015 | Measuring multicomponent constituency of gas emission flow | James W. Butler, Alex D. Colvin | 1990-05-22 |
| 4801805 | Method of measuring multicomponent constituency of gas emission flow | James W. Butler, Paul D. Maker, Alex D. Colvin | 1989-01-31 |