×

Object identification system

  • US 4,207,468 A
  • Filed: 05/08/1978
  • Issued: 06/10/1980
  • Est. Priority Date: 07/27/1976
  • Status: Expired due to Term
First Claim
Patent Images

1. In a transponder/responder system wherein said transponder is battery operated and is adapted to emit a transponder signal in response to the receipt of a remote enabling signal;

  • a responder including means for generating a timing signal, means responsive to said timing signal for generating said remote enabling signal, means for receiving said transponder signal, and means for remotely checking the condition of said battery by temporally comparing the time of receipt of said transponder signal relative to said timing signal.

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