Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6789989 | Screw having a head with concave underside | — | 2004-09-14 |
| 6152666 | Screw for use as a fastener in fibrous material such as wood | Mirco Walther, Thorsten Walther | 2000-11-28 |
| RE36741 | Self-countersinking screw with cutting receiving pockets | Chao-Hsin (Michael) Yu | 2000-06-20 |
| 5919020 | Screw | — | 1999-07-06 |
| 5683217 | Self-counter-sinking screw with cutting receiving pockets | Chao-Hsin (Michael) Yu | 1997-11-04 |