Inventor · disambiguated record
Donald Liu
Also filed as: LIU DONALD · LIU DONALD P · LIU DONALD PAKMAN
3 granted patents·4 pending applications·8 citations·filing 2001–2011
60Inventor score
Top patents by PatentIndex Score
7 records- 0150US2009187273A1Method and apparatus for controlling a vending machineLIU DONALD·Filed 2008·Application pending·0 cites
- 0249US7014189B2Alignment disk for document validatorVALTECH INTERNATIONAL LLC·Filed 2004·Granted Mar 21, 2006·5 cites·21 claims
- 0347US8582123B2Apparatus for determining thickness of a banknoteLIU DONALD PAKMAN·Filed 2011·Granted Nov 12, 2013·1 cites·19 claims
- 0441US7222712B2Document validator with locking cassetteVALTECH INTERNATIONAL LLC·Filed 2004·Granted May 29, 2007·2 cites·20 claims
- 0531US2005173220A1Sleep circuit for document validatorFiled 2004·Application pending·0 cites
- 0631US2004211708A1Document validator with interface moduleFiled 2004·Application pending·0 cites
- 0728US2002109830A1Currency validatorFiled 2001·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →