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| Number | Title | Issue Date |
| 7214020 | Looseness resisting screw and stud hole A looseness resisting screw formed with an external thread includes a first thread area having a substantially uniform outer diameter and a second thread area extended from the first thread area toward a leading end of the screw. The second thread area has a plurali... | 05/08/2007 |
| 7147421 | Screw and screwdriver A screw and a screwdriver of the present invention provide an easy insertion of screwdriver bits and the screwdriver conveys a large torque when fastening so that the screwdriver does not rise up from the screw and does not damage recesses to fasten and loosen the s... | 12/12/2006 |
| 7111531 | Screw and screwdriver A screw and a screwdriver of the present invention provide an easy insertion of screwdriver bits and the screwdriver conveys a large torque when fastening so that the screwdriver does not rise up from the screw and does not damage recesses to fasten and loosen the s... | 09/26/2006 |
