US3309689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion detection system
Assignee: GTE Sylvania Inc
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Filing: 1964-10-30
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Granted: 1967-03-14
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Expires: 1984-10-30
Abstract
No abstract record available.
Inventors
- 👤 Clare G Keeney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:52
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/1895
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
195 words
A SYSTEM FOR DETECTING INTRUSION OF A ROOM COMPRISING AN ELECTRIC LAMP AT A FIRST LOCATION IN SAID ROOM, DETECTION APPARATUS AT A SECOND LOCATION IN SAID ROOM, SAID DETECTION APPARATUS COMPRISING A BODY HAVING A PLURALITY OF PLANE SIDES WITH THE PLANES OF THE SIDES INTERSECTING EACH OTHER, SAID BODY BEING ORIENTED WITH THE INTERSECTION OF THE PLANES OF TWO OF SAID SIDES CLOSER TO SAID LAMP THAN THE REMAINDER OF THE BODY, A LIGHT RESPONSIVE ELEMENT MOUNTED ON THE EXTERIOR OF EACH OF SAID TWO SIDES AND SUBSTANTIALLY EQUALLY SPACED FROM SAID LAMP AND AT A GREATER DISTANCE THEREFROM THAN SAID INTERSECTION OF THE PLANES OF SAID TWO SIDES, EACH OF SAID ELEMENTS BEING CHARACTERIZED BY AN ELECTRICAL RESISTANCE THAT IS A FUNCTION OF THE INTENSITY OF LIGHT INCIDENT THEREUPON, A SOURCE OF ELECTRICAL ENERGY CONNECTED TO SAID ELEMENTS, SAID ELEMENTS BEING ELECTRICALLY CONNECTED IN SERIES TO FORM A VOLTAGE DIVIDER NETWORK, A SIGNAL PROCESSING CIRCUIT CONNECTED TO SAID NETWORK AND BEING RESPONSIVE TO A RELATIVE CHANGE IN VOLTAGES ACROSS SAID ELEMENTS TO PRODUCE AN OUTPUT, AND AN ALARM CIRCUIT RESPONSIVE TO SAID OUTPUT OF THE SIGNAL PROCESSING CIRCUIT TO PRODUCE AN ALARM.
Claim 2
Independent Claim
195 words
A SYSTEM FOR DETECTING INTRUSION OF A ROOM COMPRISING AN ELECTRIC LAMP AT A FIRST LOCATION IN SAID ROOM, DETECTION APPARATUS AT A SECOND LOCATION IN SAID ROOM, SAID DETECTION APPARATUS COMPRISING A BODY HAVING A PLURALITY OF PLANE SIDES WITH THE PLANES OF THE SIDES INTERSECTING EACH OTHER, SAID BODY BEING ORIENTED WITH THE INTERSECTION OF THE PLANES OF TWO OF SAID SIDES CLOSER TO SAID LAMP THAN THE REMAINDER OF THE BODY, A LIGHT RESPONSIVE ELEMENT MOUNTED ON THE EXTERIOR OF EACH OF SAID TWO SIDES AND SUBSTANTIALLY EQUALLY SPACED FROM SAID LAMP AND AT A GREATER DISTANCE THEREFROM THAN SAID INTERSECTION OF THE PLANES OF SAID TWO SIDES, EACH OF SAID ELEMENTS BEING CHARACTERIZED BY AN ELECTRICAL RESISTANCE THAT IS A FUNCTION OF THE INTENSITY OF LIGHT INCIDENT THEREUPON, A SOURCE OF ELECTRICAL ENERGY CONNECTED TO SAID ELEMENTS, SAID ELEMENTS BEING ELECTRICALLY CONNECTED IN SERIES TO FORM A VOLTAGE DIVIDER NETWORK, A SIGNAL PROCESSING CIRCUIT CONNECTED TO SAID NETWORK AND BEING RESPONSIVE TO A RELATIVE CHANGE IN VOLTAGES ACROSS SAID ELEMENTS TO PRODUCE AN OUTPUT, AND AN ALARM CIRCUIT RESPONSIVE TO SAID OUTPUT OF THE SIGNAL PROCESSING CIRCUIT TO PRODUCE AN ALARM.
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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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |