Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4804401 | Method of producing a phosphorus fertilizer soil conditioner | Arvo Wahlberg, deceased | 1989-02-14 |
| 4710219 | Production method of combined phosphorus fertilizer and soil conditioner | Arvo Wahlberg, deceased | 1987-12-01 |