Patent US3237105A successfully refreshed from Google Patents.
US3237105A
Expired / Lapsed
US
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Personnel intrusion detecting device
Assignee: Individual
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Filing: 1962-05-09
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Granted: 1966-02-22
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Expires: 1982-05-09
Abstract
No abstract record available.
Inventors
- 👤 Henry P Kalmus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:17
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2491
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
AN INTRUSION WARNING SYSTEM OF THE CAPACITIVE TYPE FOR INDICATING THE PRESENCE OF AN INTRUDER IN A GIVEN UNOBSTRUCTED AREA COMPRISING A SINGLE TRANSMITTING ELECTRODE ON ONE SIDE OF THE GIVEN AREA TO BE PROTECTED, AN ELECTRIC OSCILLATOR CIRCUIT CONNECTED BETWEEN SAID ELECTRODE AND GROUND FOR PRODUCING A QUASI-STATIONARY FIELD BETWEEN SAID ELECTRODE AND GROUND; A SINGLE RECEIVING ELECTRODE ON THE OTHER SIDE OF THE AREA TO BE PROTECTED SO ARRANGED THAT AN OBJECT TRAVERSING SAID AREA PASSES THROUGH A DIRECT LINE BETWEEN SAID TWO ELECTRODES; SAID OSCILLATOR CIRCUIT OPERATING AT A WAVE LENGTH WHICH IS VERY LARGE COMPARED TO THE DISTANCE BETWEEN THE ELECTRODES; SIGNAL AMPLIFYING MEANS CONNECTED TO SAID RECEIVING ELECTRODE FOR AMPLIFYING QUASI-STATIONARY FIELD SIGNALS RECEIVED FROM SAID TRANSMITTING ELECTRODE, AND DIRECT INDICATING MEANS FOR DETECTING AND INDICATING CHANGES IN THE RECEIVED QUASISTATIONARY FIELD SIGNALS DUE TO AN INTRUDING BODY IN SAID AREA.
Claim 2
Dependent Claim
146 words
AN INTRUSION WARNING SYSTEM OF THE CAPACITIVE TYPE FOR INDICATING THE PRESENCE OF AN INTRUDER IN A GIVEN UNOBSTRUCTED AREA COMPRISING A SINGLE TRANSMITTING ELECTRODE ON ONE SIDE OF THE GIVEN AREA TO BE PROTECTED, AN ELECTRIC OSCILLATOR CIRCUIT CONNECTED BETWEEN SAID ELECTRODE AND GROUND FOR PRODUCING A QUASI-STATIONARY FIELD BETWEEN SAID ELECTRODE AND GROUND; A SINGLE RECEIVING ELECTRODE ON THE OTHER SIDE OF THE AREA TO BE PROTECTED SO ARRANGED THAT AN OBJECT TRAVERSING SAID AREA PASSES THROUGH A DIRECT LINE BETWEEN SAID TWO ELECTRODES; SAID OSCILLATOR CIRCUIT OPERATING AT A WAVE LENGTH WHICH IS VERY LARGE COMPARED TO THE DISTANCE BETWEEN THE ELECTRODES; SIGNAL AMPLIFYING MEANS CONNECTED TO SAID RECEIVING ELECTRODE FOR AMPLIFYING QUASI-STATIONARY FIELD SIGNALS RECEIVED FROM SAID TRANSMITTING ELECTRODE, AND DIRECT INDICATING MEANS FOR DETECTING AND INDICATING CHANGES IN THE RECEIVED QUASISTATIONARY FIELD SIGNALS DUE TO AN INTRUDING BODY IN SAID AREA.
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) | 1969-02-21 | 1969-08-23 | 1970-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-02-21 | 1973-08-23 | 1974-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-02-21 | 1977-08-23 | 1978-02-22 | $7700.00 | Window Closed / Lapsed |