US3882401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Illuminating arrangement for channel or station selection indicator of a receiver of the standby type
Assignee: Electrohome Ltd
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Filing: 1974-03-04
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Granted: 1975-05-06
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Expires: 1994-03-04
Abstract
Abstract A system is disclosed for controlling the illumination of the channel or station selection indicator of a receiver of the standby type. The receiver includes at least one tube having a cathode filament. During standby operation one half power is supplied to this filament via a diode. During normal operation the diode is shorted out, so that full power is supplied to the filament. The channel or station selection indicator lamp is connected in series with another diode, the series circuit being connected across the cathode filament and the two diodes being connected with reverse polarity so that flow of current through the lamp during standby operation is inhibited but is permitted during normal operation of the receiver.
Inventors
- 👤 David E Cleland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:54
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/02; H03J1/04; H03J1/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
154 words
In a receiver of the standby type having at least one tube including a cathode filament, a lamp for indicating whether the receiver is on or off, means to be connected to an AC source and including a first diode connected in circuit with said filament for supplying reduced power to said filament during standby operation, a switch connected in shunt with said first diode for bypassing said first diode when said switch is closed to supply full power to said filament during normal operation, and a DC power supply the improvement comprising a second diode connected in a series circuit with said lamp, said series circuit being connected in shunt with said filament and being independent of said DC power supply, said first and second diodes being connected with reverse polarity to inhibit flow of current through said lamp during standby operation but permitting current to flow through said lamp during normal operation.
Claim 2
Dependent Claim
154 words
In a receiver of the standby type having at least one tube including a cathode filament, a lamp for indicating whether the receiver is on or off, means to be connected to an AC source and including a first diode connected in circuit with said filament for supplying reduced power to said filament during standby operation, a switch connected in shunt with said first diode for bypassing said first diode when said switch is closed to supply full power to said filament during normal operation, and a DC power supply the improvement comprising a second diode connected in a series circuit with said lamp, said series circuit being connected in shunt with said filament and being independent of said DC power supply, said first and second diodes being connected with reverse polarity to inhibit flow of current through said lamp during standby operation but permitting current to flow through said lamp during normal operation.
Claim 3
Dependent Claim
24 words
The combination according to claim 1 wherein said receiver includes a channel or station selection indicator, said lamp being arranged to illuminate said indicator.
Claim 4
Dependent Claim
24 words
The combination according to claim 1 wherein said means to be connected to an AC source includes a transformer having primary and secondary windings.
Claim 5
Dependent Claim
44 words
The combination according to claim 3 wherein said first diode and said filament are connected in series with each other across said secondary winding and said first and second diodes and said lamp are connected in series with each other across said secondary winding.
Claim 6
Dependent Claim
27 words
The combination according to claim 4 wherein said receiver is a television receiver and includes a channel selection indicator, said lamp being arranged to illuminate said indicator.
References Cited (Backward Citations)
US3339019A
Cited
US3339105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |