Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4785591 | Joint between two tubes of square or rectangular cross-section | — | 1988-11-22 |
| 4660331 | Concrete-filled structural tube with cantilevers, particularly for balcony floors | Nils Ryberg | 1987-04-28 |