Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-02-16
1995-08-29
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
34082554, 34082571, 340505, G08B 1314
Patent
active
054464471
ABSTRACT:
An RF tagging system which provides a large number of potential identification codes without increasing the physical size of RF tags used therein includes a plurality of RF tags (20, 90, 140, 230, 250) and an external reader (200). Each RF tag includes at least one resonant circuit (22, 92, 142, 231, 251) which is resonant at any one of a plurality of different frequencies, a receiver (34, 102, 152,244, 264) for receiving an interrogation signal, and a control (36,104,154,246, 266) responsive to receipt of an interrogation signal for causing its at least one resonant circuit to be resonant at selected ones of the different frequencies in a predetermined time sequence corresponding to a predetermined identification code. The external reader includes a detector (216, 218, 220, 222) for detecting the selected resonant frequencies of the RF tags and a decoder (226) for decoding the time sequence of the selected resonant frequencies for recovering the predetermined identification code.
REFERENCES:
patent: 3944928 (1976-03-01), Augenblick et al.
patent: 4857893 (1989-08-01), Carroll
patent: 5021767 (1991-06-01), Fockens et al.
patent: 5121106 (1992-06-01), Kataria et al.
patent: 5241298 (1993-08-01), Lian et al.
Carney Scott N.
Ghaem Sanjar
Krenz Eric L.
Lauro George L.
Lee Benjamin C.
Melamed Phillip H.
Motorola Inc.
Peng John K.
LandOfFree
RF tagging system including RF tags with variable frequency reso does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF tagging system including RF tags with variable frequency reso, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF tagging system including RF tags with variable frequency reso will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1822697