US3569964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supervisory alarm systems
Assignee: Edwards Co Inc
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Filing: 1968-05-16
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Granted: 1971-03-09
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Expires: 1988-05-16
Abstract
Abstract A supervisory alarm system is disclosed for a normally supervised alarm detection circuit actuated in response to energization from a commercial source of power. A plurality of alarm condition sensing devices is connected in multiple in the circuit and includes supervisory and alarm detection means including supervisory and alarm relays connected in series in the circuit for respectively sensing trouble and alarm conditions. Power failure detection means responsive to the failure of the source of power deenergizes the supervisory relay until power from the commercial source is restored and a control means is effective in response to the power failure detection means for energizing the circuit from a standby battery.
Inventors
- 👤 Irving Mande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:04
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/18; G08B29/181; G08B29/02; H; H02; H02J; H02J9/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A supervisory alarm system for a normally supervised alarm detection circuit normally actuated in response to energization from a commercial source of power comprising: a. a plurality of alarm condition sensing devices connected in multiple in the circuit; b. supervisory and alarm detection means including supervisory and alarm relays connected in series in the circuit for respectively sensing trouble and alarm conditions; c. power failure detection means responsive to the failure of the source of power for deenergizing the supervisory relay until power from the commercial source is restored; and d. control means effective in response to the power failure detection means to energize the circuit from a standby battery.
Claim 2
Dependent Claim
110 words
A supervisory alarm system for a normally supervised alarm detection circuit normally actuated in response to energization from a commercial source of power comprising: a. a plurality of alarm condition sensing devices connected in multiple in the circuit; b. supervisory and alarm detection means including supervisory and alarm relays connected in series in the circuit for respectively sensing trouble and alarm conditions; c. power failure detection means responsive to the failure of the source of power for deenergizing the supervisory relay until power from the commercial source is restored; and d. control means effective in response to the power failure detection means to energize the circuit from a standby battery.
Claim 3
Dependent Claim
72 words
The invention according to claim 1 wherein the circuit is a two-wire circuit which is terminated by connection of the two wires through a resistor and additional current limiting means is provided responsive to the power failure detection means for limiting the use of power for supervisory purposes during the time of power failure to a value less than the power necessary to maintain the supervisory relay in its normal actuated position.
Claim 4
Dependent Claim
38 words
The invention according to claim 2 wherein the additional current limiting means comprises means for opening the circuit near the point of termination in response to the detection of a power failure by the power failure detection means.
Claim 5
Dependent Claim
33 words
The invention according to claim 2 wherein the additional current limiting means comprises a polarized device in the circuit and means responsive to the power failure detection means for pole changing the circuit.
Claim 6
Dependent Claim
33 words
The invention according to claim 1 wherein the alarm detection means comprises means for manifesting alarm conditions by rendering active at least one normally inactive alarm indicating device over an alarm indication circuit.
Claim 7
Dependent Claim
42 words
The invention according to claim 5 wherein the alarm indicating circuit comprises a normally energized supervisory relay and means controlled by the power failure detection means for deenergizing both supervisory relays during an interval of failure of the commercial source of power.
Claim 8
Dependent Claim
23 words
The invention according to claim 6 wherein the supervisory relay in one of the circuits is deenergized by pole changing the associated circuit.
Claim 9
Dependent Claim
29 words
The invention according to claim 7 wherein the power failure means selectively pole changes one of the circuits and the alarm detection means selectively pole changes the other circuit.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |