Patent US3596713A successfully refreshed from Google Patents.
US3418649A
Expired / Lapsed
US
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Intruder detection system
Assignee: Boeing Co
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Filing: 1966-02-18
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Granted: 1968-12-24
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Expires: 1986-02-18
Abstract
No abstract record available.
Inventors
- 👤 James A Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:28
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ALARM NETWORK FOR AN INTRUDER DETECTION SYSTEM COMPRISING: RADIO FREQUENCY RECEIVER MEANS; A TRIGGER CIRCUIT COUPLED WITH SAID RECEIVER MEANS AND HAVING A HYSTERESIS CHARACTERISTIC; A FIRST A.C.-D.C. CONVERTER COUPLED WITH SAID TRIGGER CIRCUIT PROVIDING A FIRST SIGNAL IN RESPONSE TO ALTERNATING SIGNALS OF OPPOSITE POLARITY FROM SAID TRIGGER CIRCUIT; A SECOND A.C.-D.C. CONVERTER COUPLED WITH SAID RECEIVER MEANS AND PROVIDING A SECOND SIGNAL WHEN THE AMPLITUDE OF THE OUTPUT SIGNALS FROM SAID RECEIVER ARE GREATER THAN A PREDETERMINED THRESHOLD VALUE; AND ALARM MEANS COUPLED WITH EACH OF SAID CONVERTERS AND RESPONSIVE TO THE PRESENCE OF SAID SECOND SIGNAL OR THE ABSENCE OF SAID FIRST SIGNAL TO PROVIDE AN ALARM.
Claim 2
Dependent Claim
111 words
AN ALARM NETWORK FOR AN INTRUDER DETECTION SYSTEM COMPRISING: RADIO FREQUENCY RECEIVER MEANS; A TRIGGER CIRCUIT COUPLED WITH SAID RECEIVER MEANS AND HAVING A HYSTERESIS CHARACTERISTIC; A FIRST A.C.-D.C. CONVERTER COUPLED WITH SAID TRIGGER CIRCUIT PROVIDING A FIRST SIGNAL IN RESPONSE TO ALTERNATING SIGNALS OF OPPOSITE POLARITY FROM SAID TRIGGER CIRCUIT; A SECOND A.C.-D.C. CONVERTER COUPLED WITH SAID RECEIVER MEANS AND PROVIDING A SECOND SIGNAL WHEN THE AMPLITUDE OF THE OUTPUT SIGNALS FROM SAID RECEIVER ARE GREATER THAN A PREDETERMINED THRESHOLD VALUE; AND ALARM MEANS COUPLED WITH EACH OF SAID CONVERTERS AND RESPONSIVE TO THE PRESENCE OF SAID SECOND SIGNAL OR THE ABSENCE OF SAID FIRST SIGNAL TO PROVIDE AN ALARM.
References Cited (Backward Citations)
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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) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |