Patent US4274086A successfully refreshed from Google Patents.
US4274086A
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Security alarm system
Assignee: Siemens AG
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Filing: 1979-07-02
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Granted: 1981-06-16
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Expires: 1999-07-02
Abstract
Abstract In an alarm system, differently colored leads of the connection cable between the individual distributors are respectively assigned to different current paths according to a random sequence. By providing this association, targeted manipulations at the connection lines of the signal lines are prevented.
Inventors
- 👤 Wolfgang Benckendorff
- 👤 Hans Kubler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:31
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/02; G08B29/06; G08B29/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
In an alarm system of the type in which a plurality of current paths extend as alarm lines from a central station to a plurality of detectors by way of a plurality of distributors, and in which the current path alarm lines are defined by a first cable section extending between the central station and a first distributor, a plurality of second cable sections extending between adjacent distributors, and a plurality of third cable sections extending between the distributors and respective detectors, and in which the cable sections have color-coded conductors therein for the alarm lines, the improvement wherein: the color-coded conductors of each of the cable sections being randomly interconnected with different color-codes connected to one another such that each color-coded conductor of each cable section defines a different current path alarm line between their respective system elements connected thereby.
Claim 2
Dependent Claim
141 words
In an alarm system of the type in which a plurality of current paths extend as alarm lines from a central station to a plurality of detectors by way of a plurality of distributors, and in which the current path alarm lines are defined by a first cable section extending between the central station and a first distributor, a plurality of second cable sections extending between adjacent distributors, and a plurality of third cable sections extending between the distributors and respective detectors, and in which the cable sections have color-coded conductors therein for the alarm lines, the improvement wherein: the color-coded conductors of each of the cable sections being randomly interconnected with different color-codes connected to one another such that each color-coded conductor of each cable section defines a different current path alarm line between their respective system elements connected thereby.
Claim 3
Dependent Claim
45 words
The improved alarm system of claim 1, wherein: each of said distributors includes a housing having a cover; and one of said current paths is a sabotage current path and includes a sabotage element operated by opening of the housing cover to trigger an alarm.
Claim 4
Dependent Claim
45 words
The improved alarm system of claim 1, wherein: each of said detectors includes a housing having a cover; and one of said current paths is a sabotage current path and includes a sabotage element operated by opening of the housing cover to trigger an alarm.
Claim 5
Dependent Claim
75 words
The improved alarm of claim 1, wherein: each of said distributors includes a housing having a cover; each of said detectors includes a housing having a cover; and one of said current paths is a sabotage current path and includes a first sabotage element in each of said distributors and a second sabotage element in each of said detectors, said sabotage elements being operated by opening of the respective housing cover to trigger an alarm.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |