Assignee
CHANG WUN-HAI
2 granted patents·1 pending application·111 citations·filing 2004–2008
Technology mixB25B3
Top patents by PatentIndex Score
3 records- 0189US7107882B1Slip-resistant magnetic sheath for a screwdriverCHANG WUN-HAI·Filed 2004·Granted Sep 19, 2006·77 cites·3 claims
- 0286US7574946B1Magnetic assembly of a screwdriver head rodCHANG WUN-HAI·Filed 2008·Granted Aug 18, 2009·34 cites·2 claims
- 0341US2008047075A1Positioning structure for a sliding magnetic sheath of a screwdriverCHANG WUN-HAI·Filed 2006·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when CHANG WUN-HAI files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →