US3825836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delayed alarm and drowse for clock receivers
Assignee: RCA Licensing Corp
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Filing: 1972-07-03
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Granted: 1974-07-23
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Expires: 1992-07-03
Abstract
Abstract A timed full alarm condition is delayed for a short period of subdued alarm, by connecting the timer output through a modified Schmidt trigger circuit to the full-alarm generator. At the same time the timer output is connected to the subdued alarm generator, without a delay mechanism. The delay feature is given by combining a charging circuit in the Schmidt triggering scheme. A transistor of the Schmidt circuit is used for analog processing of an alarm buzz tone signal as well as for outputting the trigger impulse. A renewed delay can be manually introduced by discharging the charging circuit without restoration of the timed switch to its quiescent condition. Recharging then commences a second cycle of delay with subdued alarm, then a repeated full-alarm. The invention is embodied in a clock radio, where personal subdued alarm is the radio playing, and the full alarm is amplified clipped line waveform reproduced as a buzz on the radio loudspeaker. The discharge switch gives a drowse facility, again with radio.
Inventors
- 👤 Pyles G Dee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:52
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/28; G; G04; G04C; G04C21/00; G04C21/16; G04C21/28; G04C23/00
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
220 words
In a clock radio receiver a delayed alarm system comprising: a. an alarm signal source; b. a sound reproducing system; c. means for coupling said signal source to said sound reproducing system comprising: 1. a first active device having a control electrode and a main current conducting path; 2. biasing means coupled to said control electrode of said first active device for rendering said main current conductive path thereof nonconductive; 3. a second active device coupled to said first active device and To said alarm signal source having a control electrode and a main current conducting path and biased to a first conductive condition; 4. a charge storage device coupled to said control electrode of said first active device; 5. means for charging said storage device at a predetermined rate, the rate being selected such that a voltage at said control electrode of said first active device sufficient to render said main current path of said first active device conductive is developed after a period of time, said second active device being responsive to conduction of said first device so as to change to a second conductive condition whereby said alarm signal source is coupled by said second active device to said sound reproducing system to produce a delayed alarm condition; and 6. means operable to discharge said storage device.
Claim 2
Dependent Claim
220 words
In a clock radio receiver a delayed alarm system comprising: a. an alarm signal source; b. a sound reproducing system; c. means for coupling said signal source to said sound reproducing system comprising: 1. a first active device having a control electrode and a main current conducting path; 2. biasing means coupled to said control electrode of said first active device for rendering said main current conductive path thereof nonconductive; 3. a second active device coupled to said first active device and To said alarm signal source having a control electrode and a main current conducting path and biased to a first conductive condition; 4. a charge storage device coupled to said control electrode of said first active device; 5. means for charging said storage device at a predetermined rate, the rate being selected such that a voltage at said control electrode of said first active device sufficient to render said main current path of said first active device conductive is developed after a period of time, said second active device being responsive to conduction of said first device so as to change to a second conductive condition whereby said alarm signal source is coupled by said second active device to said sound reproducing system to produce a delayed alarm condition; and 6. means operable to discharge said storage device.
Claim 3
Dependent Claim
21 words
biasing means coupled to said control electrode of said first active device for rendering said main current conductive path thereof nonconductive;
Claim 4
Dependent Claim
21 words
biasing means coupled to said control electrode of said first active device for rendering said main current conductive path thereof nonconductive;
Claim 5
Dependent Claim
88 words
The apparatus as defined in claim 1 wherein said first active device is an input transistor and said second active device is an output transistor each transistor having a base as a control electrode and a main conducting path, said input transistor being responsive to a bias level at said base for producing a conductive state in said main conducting path of said input transistor after a period of delay which conduction biases said output transistor to a second conductive condition thereby producing a delayed full alarm signal.
Claim 6
Dependent Claim
33 words
a second active device coupled to said first active device and To said alarm signal source having a control electrode and a main current conducting path and biased to a first conductive condition;
Claim 7
Dependent Claim
33 words
a second active device coupled to said first active device and To said alarm signal source having a control electrode and a main current conducting path and biased to a first conductive condition;
Claim 8
Dependent Claim
83 words
The apparatus as defined in claim 2 wherein said charge storage device is a storage capacitor coupled to the base electrode of said input transistor, said capacitor building a charge at a predetermined rate so as to bias said base electrode of said input transistor to produce conduction in said main conductive path of said input transistor after a period of delay equivalent to the time required for said capacitor to build in charge up to said bias level of said input transistor.
Claim 9
Dependent Claim
14 words
a charge storage device coupled to said control electrode of said first active device;
Claim 10
Dependent Claim
14 words
a charge storage device coupled to said control electrode of said first active device;
Claim 11
Dependent Claim
73 words
The apparatus as defined in claim 3 wherein said means for charging said capacitor includes a resistor coupled to said capacitor and to said input transistor for causing said capacitor to build a charge over a period of time so as to bias said base electrode of said input transistor to produce a conductive state which conduction biases said output transistor to a second conductive condition thereby producing a delayed full alarm condition.
Claim 12
Dependent Claim
40 words
The apparatus as defined in claim 4 wherein said alarm signal source provides a direct current component and an audio frequency alternating component and said source further comprising rectification means to provide a direct current signal for charging said capacitor.
Claim 13
Dependent Claim
92 words
means for charging said storage device at a predetermined rate, the rate being selected such that a voltage at said control electrode of said first active device sufficient to render said main current path of said first active device conductive is developed after a period of time, said second active device being responsive to conduction of said first device so as to change to a second conductive condition whereby said alarm signal source is coupled by said second active device to said sound reproducing system to produce a delayed alarm condition; and
Claim 14
Dependent Claim
92 words
means for charging said storage device at a predetermined rate, the rate being selected such that a voltage at said control electrode of said first active device sufficient to render said main current path of said first active device conductive is developed after a period of time, said second active device being responsive to conduction of said first device so as to change to a second conductive condition whereby said alarm signal source is coupled by said second active device to said sound reproducing system to produce a delayed alarm condition; and
Claim 15
Dependent Claim
7 words
means operable to discharge said storage device.
Claim 16
Dependent Claim
7 words
means operable to discharge said storage device.
Claim 17
Dependent Claim
58 words
The apparatus as defined in claim 5 and further comprising means to signal said full alarm condition comprising a diode coupled to said output transistor and to said sound reproducing system, said diode becoming forward biased by the second conductive condition of said output transistor thereby allowing passage of the full alarm signal to said sound reproducing system.
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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |