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Digital signature collection and authentication

  • US 7,279,646 B2
  • Filed: 05/25/2001
  • Issued: 10/09/2007
  • Est. Priority Date: 05/25/2001
  • Status: Expired due to Fees
First Claim
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1. An ultrasonic pen comprising:

  • a pressure sensitive tip to generate a pressure signal;

    an ultrasonic transmitter to transmit pulses for position determination;

    a pressure activated switch coupled to the pressure sensitive tip, wherein the pressure activated switch is operable to turn on the ultrasonic transmitter when pressure is applied to the pressure sensitive tip; and

    a second transmitter to transmit the pressure signal.

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