×

Physical presence digital authentication system

  • US 7,706,838 B2
  • Filed: 07/14/2003
  • Issued: 04/27/2010
  • Est. Priority Date: 09/16/1998
  • Status: Expired due to Fees
First Claim
Patent Images

1. A portable device, comprising:

  • a device body that has a thickness less than 0.8 mm and a switch;

    memory for holding device information;

    a processor for processing signals to determine instructions to be carried out; and

    reception electronics for receiving acoustic signals, said reception electronics comprising an acoustic reception unit.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×