1
John H Bowers, Thomas J Clare: RFID tags which are virtually activated and/or deactivated and apparatus and methods of using same in an electronic security system. Checkpoint Systems, Akin Gump Strauss Hauer & Feld L, February 15, 2000: US06025780 (337 worldwide citation)

An electronic security system uses a set of predefined RFID tags. Each tag is associated with, and attached to, an article or packaging for an article. Each tag includes unique tag information which is logged into a computerized database that contains a record for each of the tags in the set. A dete ...


2
George Jay Lichtblau: A multi-frequency resonant tag circuit for use with an electronic security system having improved noise discrimination. Weingarten Maxham & Schurgin, June 29, 1976: US03967161 (189 worldwide citation)

An electronic security system adapted for use in a controlled area such as a retail store and employing a multi-frequency resonant tag circuit having distinct frequencies for detection and discrimination. An electromagnetic field is provided within the controlled area at a frequency which is swept t ...


3
Richard G Hyatt Jr, Douglas Trent, Charles Hall: Electronic security system. Medeco Security Locks, Rothwell Figg Ernst & Kurz, April 28, 1998: US05745044 (148 worldwide citation)

An electronic security system includes an electronic lock mechanism and an electronic key, each of which is provided with a microprocessor controller and a memory storing data including an ID code and encryption key codes. The lock microprocessor may either change ID codes stored in its memory or en ...


4
James M Sajkowsky: Electronic security system for monitoring and recording activity and data relating to cargo. United Security Applications ID, McCormick Paulding & Huber, March 14, 2006: US07012529 (124 worldwide citation)

A tracking system for identifying contents of a container includes an electromagnetic identification apparatus that provides an electromagnetic signal indicative of a container content data set; a writer for use in encoding the container signal onto the apparatus; a controller for receiving the enco ...


5
George J Lichtblau: Resonant tag and deactivator for use in an electronic security system. Weingarten Schurgin Gagnebin & Hayes, February 5, 1985: US04498076 (124 worldwide citation)

A resonant tag circuit having at least one resonant frequency is operative in an electronic security system in which the tag circuit is sensed and electronically deactivated to destroy the resonant characteristics of the tag circuit at the detection frequency. The tag circuit is electronically deact ...


6
Anthony F Piccoli, Gary T Mazoki: Security tag for use with article having inherent capacitance. Checkpoint Systems, Panitch Schwarze Jacobs & Nadal, January 4, 1994: US05276431 (119 worldwide citation)

A security tag for use with an electronic security system is used for attachment to an article having an inherent capacitance such as meat. The security system includes a transmitter for transmitting into a surveilled area electromagnetic energy having a center frequency within a predetermined detec ...


7
Lichtblau George Jay: Electronic security system. Weingarten Maxham & Schurgin, May 7, 1974: US3810147 (109 worldwide citation)

An electronic security system especially adapted for use in retail stores and employing a multi-frequency resonant tag circuit having distinct frequencies for detection and deactivation. A transmitting system provides an electromagnetic field within a controlled area at a frequency which is swept th ...


8
George J Lichtblau: Asymmetrical antennas for use in electronic security systems. Weingarten Maxham & Schurgin, April 7, 1981: US04260990 (101 worldwide citation)

An antenna system for use in an electronic security system and having a transmitting antenna with at least one loop lying in a plane, and a receiving antenna having at least two twisted loops lying in a common plane with each loop being twisted 180.degree. and in phase opposition with each adjacent ...


9
Jack N Figh, Robert V Cuddihy Jr, Stanley H Buchholtz, Tatsuo Rushing: Electronic security system for display cabinets. Intermark Corporation, Cohen Pontani Lieberman Pavane, February 21, 1995: US05392025 (99 worldwide citation)

A display cabinet for storing and displaying merchandise for sale to consumers is provided with one or more doors, each door being locked by a locking mechanism that can be released by a signal from a remotely located, hand-held RF transmitter operated by a store clerk or cashier. Visual and audible ...


10
Richard G Hyatt Jr, Charles E Hall: Electronic security system. Medeco Security Locks, Rothwell Figg Ernst & Kurz, August 18, 1992: US05140317 (90 worldwide citation)

An electronic security system includes an electronic lock mechanism and an electronic key, each of which is provided with a microprocessor controller and a memory storing data including an ID code. The lock microprocessor changes the ID code stored in its memory upon the operation of the lock by a c ...