Patent US3845363A successfully refreshed from Google Patents.
US3845363A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitor circuit
Assignee: Individual
•
Filing: 1973-05-07
•
Granted: 1974-10-29
•
Expires: 1993-05-07
Abstract
Abstract A monitor circuit for indicating the change of state of one of a plurality of signalizing switching elements, each switching element controlling according to its state the state of an electronic switch, said electronic switches controlling indicating means.
Inventors
- 👤 L Billion
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:56
CPC Classifications
G; G08; G08B; G08B23/00; G08B19/00; G08B25/00; G08B25/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
251 words
A monitoring system comprising, a plurality of signalizing circuits, each having an electronic switch, of the thyristor type having a control electrode and being connected in series with a signalling device to be activated by current flowing through it, all signalizing circuits being connected in parallel between two common lines the first of which is connected to the first terminal of a direct current source through a relay and a normally closed switch and the second one of which is connected to the second terminal of this current source and also to the input terminal of a two-position relay switch having a first and a second output terminal controlled by said relay, a source of control voltage being connected for switching any one of the thyristors from the non-conducting into the conducting state in response to the application of this voltage to the relative control electrode with a first and a second terminal, the first terminal being connected to the inputs of alarm switching elements each one of which, in response to the occurrance of an abnormal condition, brings this control voltage on its output which is connected to the control electrodes of its respective thyristors, the first output of the two position relay switch which is in the non-energized state of the relay connected to the input of the switch being connected to the second terminal of the control voltage source, the second output of the two position switch being connected to the first terminal of said control voltage source.
Claim 2
Dependent Claim
251 words
A monitoring system comprising, a plurality of signalizing circuits, each having an electronic switch, of the thyristor type having a control electrode and being connected in series with a signalling device to be activated by current flowing through it, all signalizing circuits being connected in parallel between two common lines the first of which is connected to the first terminal of a direct current source through a relay and a normally closed switch and the second one of which is connected to the second terminal of this current source and also to the input terminal of a two-position relay switch having a first and a second output terminal controlled by said relay, a source of control voltage being connected for switching any one of the thyristors from the non-conducting into the conducting state in response to the application of this voltage to the relative control electrode with a first and a second terminal, the first terminal being connected to the inputs of alarm switching elements each one of which, in response to the occurrance of an abnormal condition, brings this control voltage on its output which is connected to the control electrodes of its respective thyristors, the first output of the two position relay switch which is in the non-energized state of the relay connected to the input of the switch being connected to the second terminal of the control voltage source, the second output of the two position switch being connected to the first terminal of said control voltage source.
Claim 3
Dependent Claim
57 words
Monitoring system according to claim 1, characterized by a main transformer, one terminal of the primary winding thereof being the first terminal of the control voltage source, a tap on said winding constituting the second terminal of this sourCe, the direct current source being constituted by a rectifier circuit, connected to a secondary winding of said transformer.
Claim 4
Dependent Claim
138 words
Monitoring system according to claim 1, characterized in that each of the alarm switching elements is constituted by a two position switch with an input terminal and with a first and a second output terminal of which in the position of rest the input terminal is connected to the first output terminal while in the state of alarm the input terminal is connected to the second output terminal, these switches being combined into a series circuit in that of all switches except the first one the input terminal is connected to the first output terminal of the preceding switch, the input terminal of the first switch being connected to the first terminal of the source of control voltage and the second output terminals of the respective switches being connected to the respective control electrodes of the respective thyristors.
References Cited (Backward Citations)
US3296499A
Cited
US3597737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |