US5500651A
Expired / Lapsed
US
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System and method for reading multiple RF-ID transponders
Assignee: Texas Instruments Inc
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Filing: 1994-06-24
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Granted: 1996-03-19
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Expires: 2014-06-24
Abstract
Abstract A system and method for communicating between an identification reader 12 and a transponder unit 10 is disclosed herein. A first interrogation signal is transmitted from the reader 12. This first interrogation signal having a first read range. A first response signal is then received at the reader 12 after which a second interrogation signal is transmitted from the reader 12. The second interrogation signal has a second read range which is different than said first read range. The read range can be varied by varying either the amplitude or duration of the power level of the interrogation signal. A second response signal is then received at the reader 12. These consecutive responses are then compared determine a correct response signal which can be displayed.
Inventors
- 👤 Josef Schuermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:56
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10019; G06K7/10079; G06K7/0008
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
93 words
A method of communicating between an identification reader and a transponder unit, said method comprising the steps of: transmitting a first interrogation signal from said reader, said first interrogation signal having a first read range; receiving a first response signal at said reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; receiving a second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal.
Claim 2
Independent Claim
93 words
A method of communicating between an identification reader and a transponder unit, said method comprising the steps of: transmitting a first interrogation signal from said reader, said first interrogation signal having a first read range; receiving a first response signal at said reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; receiving a second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal.
Claim 3
Dependent Claim
21 words
The method of claim 1 and further comprising the step of varying the distance between the reader and the transponder unit.
Claim 4
Dependent Claim
27 words
The method of claim 1 and further comprising the step of displaying an output based upon said correct response if said first and second response signals match.
Claim 5
Dependent Claim
49 words
The method of claim 1 wherein said steps of transmitting a first interrogation signal, receiving a first response signal, transmitting a second interrogation signal, receiving a second response signal, and comparing said first and second response signals are repeated if said first and second response signals do not match.
Claim 6
Dependent Claim
55 words
The method of claim 1 and further comprising the steps off: transmitting a third interrogation signal from said reader, said third interrogation signal having a third read range; receiving a third response signal at said reader; and comparing said third response signal to said first and second response signals to determine a correct response signal.
Claim 7
Dependent Claim
61 words
The method of claim 5 wherein: said step of transmitting a first interrogation signal comprises transmitting said first interrogation signal two to three times; said step of transmitting a second interrogation signal comprises transmitting said second interrogation signal one to four times; and said step of transmitting a first interrogation signal comprises transmitting said first interrogation signal one to six times.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said first interrogation signal has a first duration and said second interrogation signal has a second duration different than said first duration.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein said first duration is longer than said second duration.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein said first interrogation signal has a first power level and said second interrogation signal has a second power level different than said first duration.
Claim 11
Dependent Claim
17 words
The method of claim 1 where said first interrogation signal has a duration of about 50 msec.
Claim 12
Dependent Claim
17 words
The method of claim 1 where said first interrogation signal has a duration of about 20 msec.
Claim 13
Dependent Claim
16 words
The method of claim 1 where said first interrogation signal has a duration of about 10msec.
Claim 14
Dependent Claim
29 words
The method of claim 1 wherein said first read range is higher than said second read range and said first interrogation signal is transmitted before the second interrogation signal.
Claim 15
Dependent Claim
21 words
The method of claim 1 wherein said step of transmitting a first interrogation signal comprises transmitting more than one interrogation signal.
Claim 16
Dependent Claim
14 words
The method of claim 1 wherein said reader comprises a hand held interrogation unit.
Claim 17
Dependent Claim
15 words
The method of claim 1 wherein said first and second interrogation signals comprise FSK signals.
Claim 18
Independent Claim
180 words
A method for identifying each object within a plurality of objects, said method comprising: providing a plurality of transponders; associating one of said transponders with each object such that each of said transponders is disposed near one of said objects; directing a first interrogation signal toward at least two of said plurality of objects, said first interrogation signal having a first read range; transmitting a first response signal from at least one of said transponders in response to said first interrogation signal; receiving said first response signal at a reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; directing a second interrogation signal toward at least two of said plurality of objects, said second interrogation signal having a second read range; transmitting a second response signal from at least one transponders in response to said second interrogation signal; receiving said second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal.
Claim 19
Independent Claim
180 words
A method for identifying each object within a plurality of objects, said method comprising: providing a plurality of transponders; associating one of said transponders with each object such that each of said transponders is disposed near one of said objects; directing a first interrogation signal toward at least two of said plurality of objects, said first interrogation signal having a first read range; transmitting a first response signal from at least one of said transponders in response to said first interrogation signal; receiving said first response signal at a reader; transmitting a second interrogation signal from said reader, said second interrogation signal having a second read range which is different than said first read range; directing a second interrogation signal toward at least two of said plurality of objects, said second interrogation signal having a second read range; transmitting a second response signal from at least one transponders in response to said second interrogation signal; receiving said second response signal at said reader; and comparing said first response signal to said second response signal to determine a correct response signal.
Claim 20
Dependent Claim
28 words
The method of claim 17 wherein said first interrogation signal has a first duration and said second interrogation signal has a second duration different than said first duration.
Claim 21
Dependent Claim
10 words
The method of claim 17 wherein said objects comprise tires.
Claim 22
Dependent Claim
21 words
The method of claim 17 wherein said steps of directing, transmitting and receiving signals are performed in a half duplex system.
Claim 23
Dependent Claim
12 words
The method of claim 20 wherein said response signals comprise FSK signals.
Claim 24
Dependent Claim
21 words
The method of claim 17 wherein said steps of directing, transmitting and receiving signals are performed in a full duplex system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |