Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D539382 | Duo sewage treatment plant | George E. Johnson | 2007-03-27 |
| D539383 | Trio sewage treatment plant | George E. Johnson | 2007-03-27 |
| 6982033 | Aerobic treatment plant with filter pipe | George E. Johnson | 2006-01-03 |
| D510757 | Trio sewage treatment plant | George E. Johnson | 2005-10-18 |
| 6827850 | Diffusion bar aerobic treatment plant | George E. Johnson | 2004-12-07 |
| 6406619 | Three stage sewage treatment plant | George E. Johnson | 2002-06-18 |
| 6228258 | Sewage treatment system with chlorinator | George E. Johnson | 2001-05-08 |
| 6200472 | Three stage sewage treatment system | George E. Johnson | 2001-03-13 |