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BEEPCARD INC

US3 patents

Top patents by PatentIndex Score

US6607136B1Aug 19, 2003

Physical presence digital authentication system

BEEPCARD INC832 citations97

US7941480B2May 10, 2011

Computer communications using acoustic signals

BEEPCARD INC31 citations95

US7480692B2Jan 20, 2009

Computer communications using acoustic signals

BEEPCARD INC10 citations92