US4249036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote alarm installation
Assignee: Berliner Bank AG
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Filing: 1979-03-12
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Granted: 1981-02-03
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Expires: 1999-03-12
Abstract
Abstract In a remote alarm installation an alarm signal emitter device and a local selector switch are associated with local telephone junction points which are connected via respective telephone lines to a control room. The selector switch normally connects the local telephone junction point to its telephone line. When an alarm signal emitter device generates an alarm signal, this controls the selector switch in such a way that it connects, instead of the local telephone junction point, the output from the alarm signal emitter device to the telephone line so that the alarm signal is transmitted into the control room. Each alarm signal indicates the kind and place of the alarm and the information is reproduced in the control room. Each alarm signal emitter device contains a number of alarm signal emitters. All of the alarm signals are transmitted in the form of a combination of different frequencies from a generator, the frequency combinations being different from one another.
Inventors
- 👤 Manfred Kutzki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
192 words
A remote alarm system, comprising, control station telephone apparatus and a control station alarm signal processing unit, a control station selector switch unit between said telephone apparatus and said alarm signal processing unit, remotely located telephone apparatus and a remotely located alarm signal emitter unit, a remotely located selector switch unit between said remotely located telephone apparatus and said alarm signal emitter unit, a dedicated telephone line between said switch units, said alarm signal emitter unit including a multi-frequency signal generator having a plurality of inputs and at least one output, said generator operating to output a composite output alarm signal which comprises a generator identification portion and a sensed input identification portion which is the source of the output signal, a set of condition sensing units connected respectively to said inputs, said selector switch units including first and second switch means respectively wherein said first switch means is responsive to said composite output alarm signal to switch said alarm signal emitter unit to said telephone line and said second switch means also being responsive to said composite output alarm signal to switch said telephone line to said alarm signal processing unit.
Claim 2
Dependent Claim
192 words
A remote alarm system, comprising, control station telephone apparatus and a control station alarm signal processing unit, a control station selector switch unit between said telephone apparatus and said alarm signal processing unit, remotely located telephone apparatus and a remotely located alarm signal emitter unit, a remotely located selector switch unit between said remotely located telephone apparatus and said alarm signal emitter unit, a dedicated telephone line between said switch units, said alarm signal emitter unit including a multi-frequency signal generator having a plurality of inputs and at least one output, said generator operating to output a composite output alarm signal which comprises a generator identification portion and a sensed input identification portion which is the source of the output signal, a set of condition sensing units connected respectively to said inputs, said selector switch units including first and second switch means respectively wherein said first switch means is responsive to said composite output alarm signal to switch said alarm signal emitter unit to said telephone line and said second switch means also being responsive to said composite output alarm signal to switch said telephone line to said alarm signal processing unit.
Claim 3
Dependent Claim
67 words
A remote alarm system according to claim 1 including at least one further multi-frequency generator with another set of condition sensing units connected to its inputs, said condition sensing units of each of said sets being connected respectively to the inputs of each said multi-frequency generator, said remotely located selector switch unit having multiple poles whereby said multi-frequency generators are connectable to said telephone line in sequence.
Claim 4
Dependent Claim
68 words
A remote alarm system according to claim 1 including at least one further multi-frequency generator with another set of condition sensing units connected to its inputs, said condition sensing units of each of said sets being connected respectively to the inputs of each said multi-frequency generator, said remotely located selector switch having at least two 2-pole switching devices connected respectively to said multi-frequency generators and arranged in series.
Claim 5
Dependent Claim
52 words
A remote alarm system according to claim 1 wherein said signal processing unit operates to send a return acknowledgement signal back to said remotely located selector switch unit, said remotely located selector switch unit being operable upon receiving said acknowledgement signal to switch said remotely located telephone apparatus to said telephone line.
Claim 6
Dependent Claim
24 words
A system according to claim 4 wherein said alarm signal emitter unit is operable to transmit repeated signals until said acknowledgement signal is received.
Claim 7
Dependent Claim
85 words
A system according to claim 1 wherein said remotely located selector switch unit includes time delay means for delaying the connecting of said alarm signal emitter unit with said telephone line after said remotely located telephone apparatus is disconnected from said telephone line, and said control station selector switch being operative to disconnect said control station telephone apparatus from said telephone line responsive to an open circuit condition at said remotely located selector switch unit during the time delay period of said time delay means.
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) | 1984-02-03 | 1984-08-04 | 1985-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-03 | 1988-08-04 | 1989-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-03 | 1992-08-04 | 1993-02-03 | $7700.00 | Window Closed / Lapsed |