×

Transponder signal collision avoidance system

  • US 5,793,324 A
  • Filed: 01/19/1996
  • Issued: 08/11/1998
  • Est. Priority Date: 01/19/1996
  • Status: Expired due to Term
First Claim
Patent Images

1. A transponder signal collision avoidance system comprising a reader and a plurality of wireless transponders for being interrogated by the reader within a wireless interrogation field, the reader being adapted for interrogating by transmitting power pulses through a number of cycles corresponding to a number of possible transponders in the field, the number of cycles corresponding to the addresses of each of respective possible transponders, the transponders each being adapted to respond to the reader by transmission only in response to a number of cycles determined by the transponders as corresponding to the address of the respective transponder, whereby to prevent the transponders from transmitting respective messages without interfering with each other.

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