Assignee
CHANG WAN LI
TW·4 granted patents·81 citations·filing 1992–1993
Top patents by PatentIndex Score
4 records- 0172US5158151ABidirectionally foldable step ladderCHANG WAN LI·Filed 1992·Granted Oct 27, 1992·46 cites·10 claims
- 0245US5195610ABidirectionally foldable step ladderCHANG WAN LI·Filed 1992·Granted Mar 23, 1993·19 cites·5 claims
- 0338US5170862ALocking device for bidirectionally foldable step laddersCHANG WAN LI·Filed 1992·Granted Dec 15, 1992·14 cites·2 claims
- 0426US5327685AElectric drill completed with a set of grinding equipmentsCHANG WAN LI·Filed 1993·Granted Jul 12, 1994·2 cites·5 claims
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