Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002397 | System of fluid inspection and/or identification | Douglas J. Littlejohn, Douglas N. Modlin | 1991-03-26 |
| 4998824 | System of fluid inspection and/or identification | Douglas J. Littlejohn, Douglas N. Modlin, Brian R. Devlin | 1991-03-12 |