Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6458175 | Oil additives and compositions | Robert D. Tack | 2002-10-01 | $115,210,000 |
| 5814110 | Chemical compositions and use as fuel additives | Kenneth W. Bartz, Jacqueline D. Bland, David P. Gillingham, Richard Dix Kerwood, Kenneth Lewtas +3 more | 1998-09-29 | $161,100,000 |
| 5425789 | Chemical compositions and their use as fuel additives | Kenneth Lewtas, David P. Gillingham, John Edward Maddox | 1995-06-20 | $75,432,000 |
| 5117679 | Testing apparatus and method | Kenneth Lewtas, John N. Mears, Brian Wiggins, Leslie G. Jones | 1992-06-02 | $40,560,000 |