Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4485538 | Building planks and apparatus for making the same | Johannes La Grouw | 1984-12-04 |
| 4400925 | Building constructions | Johannes La Grouw | 1983-08-30 |
| 4285181 | Building planks and/or methods and/or apparatus for making the same | Johannes La Grouw | 1981-08-25 |