Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865702 | Process of electrochemically re-alkalizing reinforced concrete | Oystein Vennesland | 1989-09-12 |
| 4837867 | Dual flush system for toilets | — | 1989-06-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4865702 | Process of electrochemically re-alkalizing reinforced concrete | Oystein Vennesland | 1989-09-12 |
| 4837867 | Dual flush system for toilets | — | 1989-06-13 |