US3964024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transponder for an automatic vehicle identification system
Assignee: Trane US Inc
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Filing: 1974-11-15
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Granted: 1976-06-15
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Expires: 1994-11-15
Abstract
Abstract This disclosure relates to an inductively powered type of electronic transponder for identifying a moving object passing an interrogation area. The transponder includes a tuned inductive-capacitive pick-up circuit for receiving interrogating signals. The picked up interrogating signals are rectified to produce d.c. operating power and are applied to a frequency divider for producing a frequency related transmission signal and clock data rate pulse. A latching circuit enables a shift register so that the clock pulses serially shift out binary encoded data from the shift register. The encoded data is fed to a logic network which is coupled to a balanced switching amplifier for phase modulating the transmission signal for propagation into the interrogation area.
Inventors
- 👤 Thomas J. Hutton
- 👤 John W. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:32
CPC Classifications
A; A01; A01K; A01K11/00; A01K11/006; B; B61; B61L; B61L25/00; B61L25/02; B61L25/04; B61L25/043
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
A transponder for an automatic identification system comprising, a receiving coil tuned to the frequency of an interrogating signal, a rectifier for rectifying the interrogating signal to provide a source of d.c. operating potential for the transponder, a multi-stage divider for dividing the frequency of the interrogating signal into an f/n frequency signal wherein n is an integer, a logic circuit including a plurality of gates receiving said f/n frequency signal, an amplifier is supplied with said f/n frequency signal by said gates of said logic circuit for amplifying said f/n frequency signal, a shift register encoded with binary data, a latching circuit for enabling the shift register to transfer the encoded binary data to said logic circuit and in turn to said amplifier for phase modulating said f/n frequency signal in accordance with said binary data, and a transmitting coil coupled to said amplifier and tuned to said f/n frequency signal.
Claim 2
Dependent Claim
152 words
A transponder for an automatic identification system comprising, a receiving coil tuned to the frequency of an interrogating signal, a rectifier for rectifying the interrogating signal to provide a source of d.c. operating potential for the transponder, a multi-stage divider for dividing the frequency of the interrogating signal into an f/n frequency signal wherein n is an integer, a logic circuit including a plurality of gates receiving said f/n frequency signal, an amplifier is supplied with said f/n frequency signal by said gates of said logic circuit for amplifying said f/n frequency signal, a shift register encoded with binary data, a latching circuit for enabling the shift register to transfer the encoded binary data to said logic circuit and in turn to said amplifier for phase modulating said f/n frequency signal in accordance with said binary data, and a transmitting coil coupled to said amplifier and tuned to said f/n frequency signal.
Claim 3
Dependent Claim
35 words
A transponder for an automatic identification system as defined in claim 1, wherein said receiving coil is tuned to the frequency of the interrogating signal by a capacitor connected in parallel with said receiving coil.
Claim 4
Dependent Claim
29 words
A transponder for an automatic identification system as defined in claim 1, wherein said rectifier is a full-wave rectifier employing a pair of diodes and including a smoothing capacitor.
Claim 5
Dependent Claim
35 words
A transponder for an automatic identification system as defined in claim 1, wherein said multi-stage divider provides a data rate signal to said shift register for determining the exiting rate of the encoded identification data.
Claim 6
Dependent Claim
33 words
A transponder for an automatic identification system as defined in claim 1, wherein said shift register includes a plurality of stages having its input supplied in parallel and its output derived in series.
Claim 7
Dependent Claim
22 words
A transponder for an automatic identification system as defined in claim 1, which said logic circuit includes a plurality of NOR gates.
Claim 8
Dependent Claim
24 words
A transponder for an automatic identification system as defined in claim 1, wherein said latching circuit includes a plurality of NOR gates having feedback.
Claim 9
Dependent Claim
26 words
A transponder for an automatic identification system as defined in claim 1, wherein said amplifier includes a pair of semiconductive devices connected in a push-pull configuration.
Claim 10
Dependent Claim
22 words
A transponder for an automatic identification system as defined in claim 8, wherein each of said semiconductive devices is a PNP transistor.
Claim 11
Dependent Claim
33 words
A transponder for an automatic identification system as defined in claim 1, wherein said transmitting coil is tuned to the f/n frequency signal by a capacitor connected in parallel with said transmitting coil.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |