Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6957743 | Microbiological water filter | Arthur W. Johnston, Arthur F. Johnston, Kenneth D. Hughes | 2005-10-25 |
| 6187192 | Microbiological water filter | Arthur W. Johnston, Arthur F. Johnston, Kenneth D. Hughes | 2001-02-13 |
| 6180016 | Microbiological water filtering | Arthur W. Johnston, Arthur F. Johnston, Kenneth D. Hughes | 2001-01-30 |