US3384887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intruder detection system
Assignee: GTE Sylvania Inc
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Filing: 1965-09-03
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Granted: 1968-05-21
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Expires: 1985-09-03
Abstract
No abstract record available.
Inventors
- 👤 Melvin E Trimble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:59
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2491; G08B13/2497
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
IN AN INTRUDER DETECTION, SYSTEM INCLUDING A TWOWIRE TRANSMISSION LINE BOUNDING AN AREA TO BE PROTECTED AND A FIRST DETECTOR CIRCUIT RESPONSIVE TO SIGNALS ON THE TRANSMISSION LINE FOR DETECTING AND INDICATING INTRUSION OF THE PROTECTED AREA, AN IMPEDANCE CONTROL CIRCUIT COMPRISING: A SECOND DETECTOR CIRCUIT HAVING AN INPUT CONNECTED TO THE TRANSMISSION LINE AND HAVING AN OUTPUT, SAID SECOND DETECTOR CIRCUTI RECTIFYING SIGNALS ON THE TRANSMISSION LINE, AN OSCILLATOR HAVING AN OUTPUT, VARIABLE IMPEDANCE MEANS HAVING AN OUTPUT CONNECTED TO THE TRANSMISSION LINE, HAVING A FIRST INPUT CONNECTED TO THE OUTPUT OF SAID OSCILLATOR FOR MODULATING THE VALUE OF SAID VARIABLE IMPEDANCE MEANS AND THE THE VALUE OF THE TRANSMISSION LINE CHARACTERISTIC IMPEDANCE, AND HAVING A SECOND INPUT, MEANS FOR DETECTING THE OUTPUT OF SAID SECOND DETECTOR AS A FUNCTION OF THE OUTPUT OF SAID SECOND DETECTOR MEANS FOR SUMMING THE OUTPUT OF SAID DETECTING MEANS, SAID SUMMING MEANS HAVING AN OUTPUT CONNECTED TO THE SECOND INPUT TO SAID VARIABLE IMPEDANCE MEANS FOR VARYING THE EFFECTIVE VALUE THEREOF AND THE EFFECTIVE VALUE OF THE TRANSMISSION LINE CHARACTERISTIC IMPEDANCE.
Claim 2
Dependent Claim
179 words
IN AN INTRUDER DETECTION, SYSTEM INCLUDING A TWOWIRE TRANSMISSION LINE BOUNDING AN AREA TO BE PROTECTED AND A FIRST DETECTOR CIRCUIT RESPONSIVE TO SIGNALS ON THE TRANSMISSION LINE FOR DETECTING AND INDICATING INTRUSION OF THE PROTECTED AREA, AN IMPEDANCE CONTROL CIRCUIT COMPRISING: A SECOND DETECTOR CIRCUIT HAVING AN INPUT CONNECTED TO THE TRANSMISSION LINE AND HAVING AN OUTPUT, SAID SECOND DETECTOR CIRCUTI RECTIFYING SIGNALS ON THE TRANSMISSION LINE, AN OSCILLATOR HAVING AN OUTPUT, VARIABLE IMPEDANCE MEANS HAVING AN OUTPUT CONNECTED TO THE TRANSMISSION LINE, HAVING A FIRST INPUT CONNECTED TO THE OUTPUT OF SAID OSCILLATOR FOR MODULATING THE VALUE OF SAID VARIABLE IMPEDANCE MEANS AND THE THE VALUE OF THE TRANSMISSION LINE CHARACTERISTIC IMPEDANCE, AND HAVING A SECOND INPUT, MEANS FOR DETECTING THE OUTPUT OF SAID SECOND DETECTOR AS A FUNCTION OF THE OUTPUT OF SAID SECOND DETECTOR MEANS FOR SUMMING THE OUTPUT OF SAID DETECTING MEANS, SAID SUMMING MEANS HAVING AN OUTPUT CONNECTED TO THE SECOND INPUT TO SAID VARIABLE IMPEDANCE MEANS FOR VARYING THE EFFECTIVE VALUE THEREOF AND THE EFFECTIVE VALUE OF THE TRANSMISSION LINE CHARACTERISTIC IMPEDANCE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |