Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5268093 | Portable water purification system | Brian Francis Sullivan | 1993-12-07 |
| 5106500 | Portable water purification system including a filter cleaning mechanism | Brian Francis Sullivan, David E. E. Carmein | 1992-04-21 |
| 4945725 | Differential-area piston type mixed-phase motors | David E. E. Carmein | 1990-08-07 |
| 4902207 | Energy recovery apparatus | David E. E. Carmein | 1990-02-20 |
| 4793153 | Energy recovery apparatus | David E. E. Carmein | 1988-12-27 |