Methods for presenting and determining the efficacy of progressive pictorial and motion-based CAPTCHAs | Patent Publication Number 20090328150

US 20090328150 A1
Patent NumberUS 08752141 B2
Application Number12494083
Filled DateJun 29, 2009
Priority DateJun 27, 2008
Publication DateDec 31, 2009
Original Assignee
Inventor/ApplicantsJohn Nicholas Gross
JOHN NICHOLAS GROSS
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