US3125753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signalling system
Assignee: —
•
Filing: —
•
Granted: 1964-03-17
•
Expires: 1981-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:34
CPC Classifications
B; B61; B61L; B61L25/00; B61L25/02; B61L25/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
INTERROGATOR-RESPONDER APPARATUS COMPRISING IN COMBINATION, INTERROGATOR MEANS FOR TRANSMITTING A PLURALITY OF ELECTROMAGNETIC INTERROGATION SIGNALS OF DIFFERENT FREQUENCIES, AND A PASSIVE RESPONDER OPERABLE TO PROVIDE AN ELECTROMAGNETIC RESPONSE SIGNAL ON A FURTHER FREQUENCY UPON RECEIPT OF SELECTED ONES OF SAID DIFFERENT FREQUENCIES; SAID RESPONDER COMPRISING A PLURALITY OF TUNED CIRCUITS EACH RESONANT AT A DIFFERENT FREQUENCY, EACH OF SAID CIRCUITS BEING CONNECTED TO PROVIDE AN OUTPUT VOLTAGE UPON RECEIPT OF A SIGNAL FROM SAID INTERROGATOR WHICH CORRESPONDS IN FREQUENCY TO ITS INDIVIDUAL RESONANCE FREQUENCY, EACH OF SAID CIRCUITS BEING CONNECTED TO APPLY ITS OUTPUT VOLTAGE TO A PAIR OF SUPPLY CONDUCTORS, AND RESPONSE OSCILLATOR MEANS CONNECTED TO SAID CONDUCTORS TO BE POWERED BY SAID OUTPUT VOLTAGES AND THEREBY TO PROVIDE SAID RESPONSE SIGNAL.
Claim 2
Dependent Claim
123 words
INTERROGATOR-RESPONDER APPARATUS COMPRISING IN COMBINATION, INTERROGATOR MEANS FOR TRANSMITTING A PLURALITY OF ELECTROMAGNETIC INTERROGATION SIGNALS OF DIFFERENT FREQUENCIES, AND A PASSIVE RESPONDER OPERABLE TO PROVIDE AN ELECTROMAGNETIC RESPONSE SIGNAL ON A FURTHER FREQUENCY UPON RECEIPT OF SELECTED ONES OF SAID DIFFERENT FREQUENCIES; SAID RESPONDER COMPRISING A PLURALITY OF TUNED CIRCUITS EACH RESONANT AT A DIFFERENT FREQUENCY, EACH OF SAID CIRCUITS BEING CONNECTED TO PROVIDE AN OUTPUT VOLTAGE UPON RECEIPT OF A SIGNAL FROM SAID INTERROGATOR WHICH CORRESPONDS IN FREQUENCY TO ITS INDIVIDUAL RESONANCE FREQUENCY, EACH OF SAID CIRCUITS BEING CONNECTED TO APPLY ITS OUTPUT VOLTAGE TO A PAIR OF SUPPLY CONDUCTORS, AND RESPONSE OSCILLATOR MEANS CONNECTED TO SAID CONDUCTORS TO BE POWERED BY SAID OUTPUT VOLTAGES AND THEREBY TO PROVIDE SAID RESPONSE SIGNAL.
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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) | 1967-03-17 | 1967-09-16 | 1968-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-03-17 | 1971-09-16 | 1972-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-03-17 | 1975-09-16 | 1976-03-17 | $7700.00 | Window Closed / Lapsed |