Patent US2738140A successfully refreshed from Google Patents.
US4437089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual sensitivity intrusion detection system
Assignee: PROMOCAB SA
•
Filing: 1981-06-23
•
Granted: 1984-03-13
•
Expires: 2001-06-23
Abstract
Abstract At least two circuits of sensors for detection of human presence are arranged in a protected zone and are capable of producing electric signals when they detect a human presence. In a preferred embodiment, when a human presence is detected by a first sensor circuit, the sensitivity of the sensors of the second sensor circuit is increased.
Inventors
- 👤 Serge Achard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:25
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2491; Y; Y10; Y10S; Y10S250/00; Y10S250/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
A system for protecting a zone against human aggression, comprising at least two circuits of sensors for detection of human presence, said sensor circuits arranged within said zone and capable of producing electric signals when they detect a human presence, response means activated by said electric signals for indicating human presence, electronic processing means arranged between the sensors for detection of human presence and the response means, to operate first response means when they receive an electrical signal from a detection sensor of a first circuit of sensors and second response means when they receive an electrical signal from a detection sensor of a second circuit of sensors, said electronic processing means comprising means to increase the sensitivity of the sensors of the second circuit of sensors at the time of reception of a signal from a sensor of the first circuit of sensors.
Claim 2
Independent Claim
144 words
A system for protecting a zone against human aggression, comprising at least two circuits of sensors for detection of human presence, said sensor circuits arranged within said zone and capable of producing electric signals when they detect a human presence, response means activated by said electric signals for indicating human presence, electronic processing means arranged between the sensors for detection of human presence and the response means, to operate first response means when they receive an electrical signal from a detection sensor of a first circuit of sensors and second response means when they receive an electrical signal from a detection sensor of a second circuit of sensors, said electronic processing means comprising means to increase the sensitivity of the sensors of the second circuit of sensors at the time of reception of a signal from a sensor of the first circuit of sensors.
Claim 3
Dependent Claim
20 words
The system according to claim 1, wherein the sensors of said first circuit of sensors are of the all-or-nothing type.
Claim 4
Independent Claim
25 words
The system according to any one of claims 1 or 2, wherein the sensors of said second circuit of sensors are of the cumulative type.
Claim 5
Dependent Claim
17 words
The system according to claim 1, which further comprises telecommunications means controlled by said electronic processing means.
Claim 6
Dependent Claim
28 words
The system according to claim 1, wherein the electronic processing means comprises means capable of comparing the signals received from the sensors with typical signals retained in memory.
Claim 7
Dependent Claim
24 words
The system according to claim 1, wherein the electronic processing means comprises means capable of operating the response means in accordance with fixed programs.
Claim 8
Dependent Claim
23 words
The system according to claim 1, wherein the electronic processing means comprises means capable of operating the response means in a variable manner.
Claim 9
Dependent Claim
38 words
The system according to claim 1, wherein the electronic processing means is arranged to enable the functional modification of certain components of the system in the case of an anomaly in the function of one of its components.
Claim 10
Dependent Claim
23 words
The system according to claim 1, wherein the electronic processing means comprises means capable of operating the response means independently of each other.
Claim 11
Dependent Claim
27 words
The system according to claim 1, wherein the first response means activated by the sensors of the first circuit of sensors are arranged to provide a pre-alarm.
References Cited (Backward Citations)
US3074053A
Cited
US3967283A
Cited
US4092643A
Cited
US4021796A
Cited
US4142187A
Cited
GB2021893B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |