The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2006
Filed:
May. 18, 2004
Stewart E. Hall, Wellington, FL (US);
Brent F. Balch, Fort Lauderdale, FL (US);
Richard L. Copeland, Lake Worth, FL (US);
Stewart E. Hall, Wellington, FL (US);
Brent F. Balch, Fort Lauderdale, FL (US);
Richard L. Copeland, Lake Worth, FL (US);
Sensormatic Electronics Corporation, Boca Raton, FL (US);
Abstract
An EAS or RFID system including first and second core antenna systems. The first and second antenna systems establish magnetic fields having opposite directions and are positioned so that the fields at least partially cancel outside of an interrogation zone for detecting an EAS or RFID tag. There is also provided an EAS or RFID wherein the magnetic field direction established by a core antenna is varied at certain time intervals to minimize the effects of null zones in the interrogation zone.