Patents Assigned to Security Tag Systems, Inc.
  • Patent number: 4727360
    Abstract: 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 frequency. The transponder includes an amorphous magnetic material component for storing energy from the electromagnetic radiation detected at the first frequency for transmission as the electromagnetic radiation transmitted at the second frequency.
    Type: Grant
    Filed: July 31, 1986
    Date of Patent: February 23, 1988
    Assignee: Security Tag Systems, Inc.
    Inventors: Lucian G. Ferguson, Lincoln H. Charlot, Jr.
  • Patent number: 4692746
    Abstract: A recording-tape-reel assembly, such as used with a computer, has an electronic tag to enable the presence of the assembly to be detected in a presence detection system in order to inhibit the unauthorized removal of the assembly from premises equipped with such a system. The assembly includes a reel for holding a recording tape, an electronic tag for enabling detection of the presence of the assembly in a presence detection system, and a housing that isolates the electronic tag from the recording tape and makes the tag inaccessible to users of the assembly. Electronic tags are housed in both reels and cassettes that contain reels.
    Type: Grant
    Filed: February 26, 1986
    Date of Patent: September 8, 1987
    Assignee: Security Tag Systems, Inc.
    Inventors: Richard J. Budin, James G. Wyatt, Jr., Fred W. Herman
  • Patent number: 4670740
    Abstract: A batteryless, portable, frequency divider consists of a single resonant circuit consisting of an inductor and a diode. The resonant circuit detects electromagnetic radiation at a first predetermined frequency and responds to said detection by transmitting electromagnetic radiation at a second frequency that is one-half of the first frequency. The circuit is resonant at the second frequency when the voltage across the diode is zero. The frequency divider is utilized in a presence detection system that uses a tag containing the frequency divider. The system transmits electromagnetic radiation at the first frequency into a surveillance zone, and detects the second frequency to detect the presence of the tag in the surveillance zone.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: June 2, 1987
    Assignee: Security Tag Systems, Inc.
    Inventors: Fred W. Herman, Lincoln H. Charlot, Jr.
  • Patent number: 4654641
    Abstract: A batteryless, portable, frequency divider, consisting of a single resonant circuit including a nonlinear inductor having a core made of amorphous magnetic material; and a capacitance connected in series with the inductor to define a resonant circuit that 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 frequency. The resonant circuit may further include a second inductor connected in series with the nonlinear inductor and the capacitance to define the resonant circuit. The core of the nonlinear inductor includes an elongated thin flat ribbon of low coercivity amorphous magnetic material.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: March 31, 1987
    Assignee: Security Tag Systems, Inc.
    Inventors: Lucian G. Ferguson, Lincoln H. Charlot, Jr.
  • Patent number: 4523356
    Abstract: 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 a predominantly open end covering the anvil and axially aligned with the anvil for axially receiving a pin that is axially received by the bore of the anvil. The anvil is longitudinally movable along its bore axis with respect to the cup. The spring forces the anvil toward the confining end of the cup. The first set of balls engages the anvil and is forced by the anvil toward the confining end of the cup by the spring. The second set of balls is in the extreme confining end of the cup for clutching the pin.
    Type: Grant
    Filed: February 27, 1984
    Date of Patent: June 18, 1985
    Assignee: Security Tag Systems, Inc.
    Inventor: Lincoln H. Charlot, Jr.
  • Patent number: 4481428
    Abstract: 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 first and second LC circuits for causing the second LC circuit to transmit electromagnetic radiation at the second frequency in response to the first LC circuit detecting electromagnetic radiation at the first frequency. The first and second LC circuits respectively include inductance coils that are positioned orthogonally to one another so as not to be mutually coupled. The frequency divider is operable solely from unrectified energy at the first frequency provided in the first circuit upon receipt of the electromagnetic radiation at the first frequency detected by the first LC circuit.
    Type: Grant
    Filed: May 19, 1981
    Date of Patent: November 6, 1984
    Assignee: Security Tag Systems, Inc.
    Inventor: Lincoln H. Charlot, Jr.