US4401976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple sensor interconnected alarm system responsive to different variables
Assignee: Individual
•
Filing: 1981-01-14
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Granted: 1983-08-30
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Expires: 2001-01-14
Abstract
Abstract An alarm, safeguarding and monitoring system for a room zone includes a plurality of sensors disposed at different positions and responsive to different physical phenomena, such as an ultrasonic sensor, an infrared sensor and a microwave sensor. The sensor outputs are individually coupled to majority decision, central processing unit and alarm generator circuits by a plurality of redundant signal links to minimize malfunction in the event of disruption or tampering.
Inventors
- 👤 Hans-Gunther Stadelmayr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:54
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/18; G08B29/183; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B29/02; G08B29/04; G08B29/046; G08B29/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
63 words
Alarm, safeguarding and monitoring system having a plurality of sensors in one room, comprising: at least three sensors which respond to physical phenomena of a different nature which always occur in every alarm event, said sensors being disposed to cover the same monitoring zone, and means responsive to output signals from said sensors for generating an alarm signal according to the majority principle.
Claim 2
Dependent Claim
63 words
Alarm, safeguarding and monitoring system having a plurality of sensors in one room, comprising: at least three sensors which respond to physical phenomena of a different nature which always occur in every alarm event, said sensors being disposed to cover the same monitoring zone, and means responsive to output signals from said sensors for generating an alarm signal according to the majority principle.
Claim 3
Dependent Claim
18 words
Alarm, safeguarding and monitoring system according to claim 1, wherein three sensors respond to three different physical phenomena.
Claim 4
Dependent Claim
31 words
Alarm, safeguarding and monitoring system, according to claim 2, wherein at least two of the sensors work according to the Doppler principle and are disposed angularly with respect to one another.
Claim 5
Dependent Claim
26 words
Alarm, safeguarding and monitoring system according to claim 3, wherein the sensors working according to the Doppler principle are disposed orthogonally with respect to one another.
Claim 6
Dependent Claim
38 words
Alarm, safeguarding and monitoring system according to claim 3, wherein the outputs of the individual sensors working according to the Doppler principle are fed to an OR circuit, whose output is coupled to said alarm signal generating means.
Claim 7
Dependent Claim
19 words
Alarm, safeguarding and monitoring system according to claim 3, wherein different types of sensors are integrated in one casing.
Claim 8
Dependent Claim
39 words
Alarm, safeguarding and monitoring system according to claim 3, wherein individual signal connections between different functional groups have at least three signal paths which are independent of one another and whose outputs are processed by a majority logic circuit.
Claim 9
Dependent Claim
25 words
Alarm, safeguarding and monitoring system according to claim 3, wherein an activate/deactivate circuit has at least two signal paths which are independent of one another.
Claim 10
Dependent Claim
48 words
Alarm, safeguarding and monitoring system according to claim 3, wherein an on/off circuit and peripheral monitoring and actuating units are not connected via any system wiring, so that even if these units are located this does not lead to the location or destruction of a central processing unit.
Claim 11
Dependent Claim
32 words
Alarm, safeguarding and monitoring system according to claim 9, wherein coding of the central processing unit ensues via an external unit which has no direct connecting path to the central processing unit.
Claim 12
Dependent Claim
33 words
Alarm, safeguarding and monitoring system according to claim 10, wherein in the case of permanent connection leads to on/off switches, monitoring and actuating units, a galvanic interruption is inserted into the connection leads.
Claim 13
Dependent Claim
19 words
Alarm, safeguarding and monitoring system according to claim 11, wherein the galvanic interruption is effected via a relay circuit.
Claim 14
Dependent Claim
19 words
Alarm, safeguarding and monitoring system according to claim 2, wherein two ultrasonic sensors and one infrared sensor are provided.
Claim 15
Dependent Claim
19 words
Alarm, safeguarding and monitoring system according to claim 2, wherein two microwave sensors and one infrared sensor are provided.
Claim 16
Dependent Claim
34 words
Alarm, safeguarding and monitoring system according to claim 2, wherein two sensor pairs disposed angularly to one another, each pair comprising a microwave sensor and an ultrasonic sensor, and one infrared sensor are provided.
Claim 17
Dependent Claim
20 words
Alarm, safeguarding and monitoring system according to claim 15, wherein the infrared sensor is disposed separate from the sensor pairs.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |