US3952809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series to parallel transfer circuit for initiator string
Assignee: Kidde Inc
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Filing: 1975-03-14
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Granted: 1976-04-27
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Expires: 1995-03-14
Abstract
Abstract A fire protection system including a plurality of suppressor units activatable to suppress a detected fire; a plurality of electrical current responsive activators, one associated with each of the suppressor units and adapted to induce activation thereof; a control circuit connecting the activators in series and including an actuator for initiating activating current flow to the activators; and an auxiliary circuit for connecting the activators parallel in response to the initiation of activating current flow by the actuator, the auxiliary circuit including a plurality of electronic switches, one connected between the supply and each of the junctions between each pair of series connected activators.
Inventors
- 👤 William B. Osborne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:15
CPC Classifications
A; A62; A62C; A62C37/00; A62C37/36; A62C37/38; A62C37/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
An electrical protection system comprising: a plurality of suppressor units activatable to suppress an abnornal condition; a plurality of electrical current responsive activators, one associated with each of said suppressor units and adapted to induce activation thereof; electrical current supply means; control circuit means connecting said activators in series and comprising actuator means for initiating activating current flow from said supply means to said series connected activators; and auxiliary circuit means comprising switch means for connecting said activators in parallel in response to initiation of activating current flow by said actuator means, said switch means comprising a plurality of electronic switches, one connected between each of the junctions between each pair of said series connected activators and said supply means.
Claim 2
Dependent Claim
120 words
An electrical protection system comprising: a plurality of suppressor units activatable to suppress an abnornal condition; a plurality of electrical current responsive activators, one associated with each of said suppressor units and adapted to induce activation thereof; electrical current supply means; control circuit means connecting said activators in series and comprising actuator means for initiating activating current flow from said supply means to said series connected activators; and auxiliary circuit means comprising switch means for connecting said activators in parallel in response to initiation of activating current flow by said actuator means, said switch means comprising a plurality of electronic switches, one connected between each of the junctions between each pair of said series connected activators and said supply means.
Claim 3
Dependent Claim
68 words
A system according to claim 1 wherein said supply means comprises a DC supply and said switches comprise a first set of switches one connected between each alternate junction between said series connected activators and one terminal of said supply means, and a second set of switches one connected between each of the other alternate junctions between said series connected activators and another terminal of said supply means.
Claim 4
Dependent Claim
41 words
A system according to claim 2 including first control switch means connected between said one terminal and each switch of said first set, and a second control switch means connected between said other terminal and each switch of said second set.
Claim 5
Dependent Claim
30 words
A system according to claim 3 wherein said first and second control switch means comprise relay contacts and a relay winding therefor connected for energization by said activating current flow.
Claim 6
Dependent Claim
23 words
A system according to claim 4 wherein said auxiliary circuit means comprises delay means for delaying energizing current flow to said relay winding.
Claim 7
Dependent Claim
17 words
A system according to claim 5 wherein said suppressor units comprise vessels containing a fire suppressing agent.
Claim 8
Dependent Claim
22 words
A system according to claim 6 wherein said activators comprises explosive squibs for inducing release of said suppressing agent from said vessels.
Claim 9
Dependent Claim
19 words
A system according to claim 1 wherein said actuator means comprises a sensor means for detecting said abnormal condition.
Claim 10
Dependent Claim
68 words
A system according to claim 8 wherein said supply means comprises a DC supply and said switches comprise a first set of switches one connected between each alternate junction between said series connected activators and one terminal of said supply means, and a second set of switches one connected between each of the other alternate junctions between said series connected activators and another terminal of said supply means.
Claim 11
Dependent Claim
41 words
A system according to claim 9 including first control switch means connected between said one terminal and each switch of said first set, and a second control switch means connected between said other terminal and each switch of said second set.
References Cited (Backward Citations)
US2373819A
Cited
US3713491A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |