1
Lincoln H Charlot Jr: Ball clutch mechanism with two sets of balls in separate radial planes. Security Tag Systems, Baker Maxham Callan & Jester, June 18, 1985: US04523356 (45 worldwide citation)

A ball clutch mechanism for restraining a pin from longitudinal movement, including an anvil, a radially symmetrical cup, a spring and two two-ball sets of uniformly dimensioned balls. The anvil has an axial bore for axially receiving the pin. The cup has a confining end, a tapered interior wall and ...


2
Lincoln H Charlot Jr: Batteryless, portable, frequency divider useful as a transponder of electromagnetic radiation. Security Tag Systems, Brown & Martin, November 6, 1984: US04481428 (43 worldwide citation)

A batteryless, portable, frequency divider including a first LC circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; a second LC circuit that is resonant at a second frequency that is one-half the first frequency; and a transistor coupling the ...


3
Dennis L Hogan: Detrimental-substance-containing theft-deterrent device. Security Tag Systems, Edward W Callan, July 31, 1990: US04944075 (41 worldwide citation)

A device for deterring theft of a protected article, including a pin and clutch for attaching the device to the article, with the pin and clutch being embodied in two components that are adapted to be locked together on opposite sides of a portion of the protected article to prevent unauthorized rem ...


4
Dennis L Hogan, John L Lynch, Lincoln H Charlot Jr: Expulsion of detrimental substance from theft-deterrent device. Security Tag Systems, Edward W Callan, October 8, 1991: US05054172 (40 worldwide citation)

In a device for deterring theft of a protected article, including a pin and clutch respectively embodied in two components that are adapted to be locked together on opposite sides of a portion of the protected article to prevent unauthorized removal of the device from the article, the pin-containing ...


5
Lucian G Ferguson, Lincoln H Charlot Jr: Frequency-dividing transponder and use thereof in a presence detection system. Security Tag Systems, Edward W Callan, February 23, 1988: US04727360 (38 worldwide citation)

A batteryless, portable, transponder useful in a tag for a presence detection system. The transponder detects electromagnetic radiation at a first predetermined frequency and responds to said detection by transmitting electromagnetic radiation at a second frequency that is a subharmonic of the first ...


6
Robert C Thurmond, Edward J DiCarlo, Fred W Herman, Dennis L Hogan, John L Lynch, Hildan B Russell: Theft-deterrent device providing force-sensitive tamper detection. Security Tag Systems, Edward W Callan, September 13, 1994: US05347262 (36 worldwide citation)

A pin-and-clutch theft-deterrent device that enables instantaneous detection of separation-force tampering with the theft-deterrent device. The device includes a pin in one component and a clutch assembly in a second component for attaching the device to an article to be protected by grasping the pi ...


7
Lincoln H Charlot Jr, Carter W Clarke Jr: Detrimental-substance-containing theft-deterrent device. Security Tag Systems, Edward W Callan, July 16, 1991: US05031287 (34 worldwide citation)

A device for deterring theft of a protected article, including a pin and clutch for attaching the device to the article, with the pin and clutch being embodied in two components that are adapted to be locked together on opposite sides of a portion of the protected article to prevent unauthorized rem ...


8
Fred W Herman: Magnetically-coupled, two-resonant-circuit, frequency-division tag. Security Tag Systems, Edward W Callan, November 12, 1991: US05065137 (32 worldwide citation)

A batteryless, portable, frequency divider according to the present invention includes a first resonant LC circuit that is resonant at a first frequency for receiving electromagnetic radiation at the first frequency; and a second resonant LC circuit that is resonant at a second frequency that is one ...


9
Dennis L Hogan, Donald J Beach: Theft-deterrent device including clamp. Security Tag Systems, Edward W Callan, August 25, 1992: US05140836 (26 worldwide citation)

A clamp for use as a theft deterrent device includes a U-shaped member having first and second legs, with each leg including a shelf disposed on the inside edge of the member and extending laterally toward the opposite leg; a housing defining a pair of longitudinal channels for receiving the legs of ...


10
Fred W Herman, Lincoln H Charlot Jr, Ming R Lian, Douglas A Drew: Adjusting magnetic bias field intensity in EAS presence detection system to enhance detection. Security Tag Systems, Edward W Callan, April 11, 1995: US05406262 (25 worldwide citation)

An EAS presence detection system includes a transmitter for transmitting an electromagnetic radiation signal of a first predetermined frequency into a surveillance zone; a tag for attachment to an article to be detected within the surveillance zone, the tag containing a transponder including a mater ...