Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9630857 | System and method for closed water circulation | — | 2017-04-25 |
| 8449219 | Water-storage and water-purification system | Holger Burkhardt | 2013-05-28 |
| 8256989 | Water-storage and water-purification system | Holger Burkhardt | 2012-09-04 |