Assignee
HU CHENG-TSAN
4 granted patents·64 citations·filing 2004–2007
Top patents by PatentIndex Score
4 records- 0190US7185565B1Screwdriver having a ratchet mechanismHU CHENG-TSAN·Filed 2006·Granted Mar 6, 2007·30 cites·3 claims
- 0276US7353734B1Screwdriver having a ratchet mechanismHU CHENG-TSAN·Filed 2007·Granted Apr 8, 2008·12 cites·5 claims
- 0364US6968760B2Precision screwdriver having a turning headHU CHENG-TSAN·Filed 2004·Granted Nov 29, 2005·14 cites·3 claims
- 0456US6997088B2Screwdriver heads chamber for a precise screwdriverHU CHENG-TSAN·Filed 2004·Granted Feb 14, 2006·8 cites·2 claims
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