Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1983-11-22
1986-08-12
Pitts, Harold I.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235487, G06K 500
Patent
active
046058451
ABSTRACT:
A detectable card is constituted by a sheet substrate made of a synthetic resin, a first capacitor including a pair of electrodes bonded to opposite surfaces of the substrate at the central portion, a second capacitor including a pair of electrodes bonded to the opposite surfaces of the substrate at the peripheries thereof, a spiral connector interconnecting a central electrode and peripheral electrode disposed, the spiral connector forming an inductance of an LC tuning circuit. The assembly is sealed in a cover made of inner and outer synthetic resin films. The card may also be provided with a plurality of LC tuning circuits having different tuning frequencies, and the card may be used in an entry and departure checking apparatus comprising a sweep signal generator for producing sweep signals adapted to sweep the LC tuning circuits, a tuning point detector supplied with an output of the sweep signal generator for producing a binary code constituted by a plurality of bits corresponding to the status of the LC tuning circuits and a register for converting the binary code into a decimal value, and a selector responsive to the decimal value for operating a gate in a way of either inhibiting or permitting passage of a person carrying the card.
REFERENCES:
patent: 3810147 (1974-05-01), Lichtblau
patent: 3863244 (1975-01-01), Lichtblau
patent: 4058839 (1977-11-01), Darjany
LandOfFree
Detectable card and entry and departure checking apparatus utili does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Detectable card and entry and departure checking apparatus utili, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detectable card and entry and departure checking apparatus utili will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1946318