Patent US3694755A successfully refreshed from Google Patents.
US3694755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery economy apparatus
Assignee: Individual
•
Filing: 1970-11-13
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Granted: 1972-09-26
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Expires: 1990-11-13
Abstract
Abstract A radio receiver having an economizer circuit of the type in which the current path from a supply battery to the major parts of the receiver is periodically switched so that it is interrupted during idle periods of the receiver and having a decoder for a selective calling system, in which the delay in reversion to periodic switching of the economizer circuit is utilized to hold the said current path conductive during the reception of one or more tones of a selective calling sequence subsequent to the reception of a first tone.
Inventors
- 👤 Michael Henry Evans Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/02; H04W52/0209; H04W52/0225; H04W52/0229; H04W88/00; H04W88/02; H04W88/022; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A battery-operated radio receiver including a battery economizer circuit for reducing the consumption of power from the receiver battery in the absence of an incoming signal to the receiver, said economizer circuit comprising switch means connected in the direct current path from the battery to the receiver, means for periodically rendering said switch means alternately conductive and non-conductive, means for maintaining said switch means conductive upon receipt by said radio receiver of an incoming signal to which the receiver is adapted to respond, and a first delay circuit including a capacitor for maintaining said switch means conductive for a period of time after cessation of said incoming signal, said radio receiver including circuit means responsive to a plurality of successively received tones, whereby said first received tone acts to maintain said switch means conductive for the duration of said first tone, and said delay circuit further maintains said switch means conductive after cessation of said first tone for a period during which a second tone can be received subsequent to said first tone, said second tone operating said circuit means to maintain said switch means conductive after cessation of said second tone.
Claim 2
Dependent Claim
192 words
A battery-operated radio receiver including a battery economizer circuit for reducing the consumption of power from the receiver battery in the absence of an incoming signal to the receiver, said economizer circuit comprising switch means connected in the direct current path from the battery to the receiver, means for periodically rendering said switch means alternately conductive and non-conductive, means for maintaining said switch means conductive upon receipt by said radio receiver of an incoming signal to which the receiver is adapted to respond, and a first delay circuit including a capacitor for maintaining said switch means conductive for a period of time after cessation of said incoming signal, said radio receiver including circuit means responsive to a plurality of successively received tones, whereby said first received tone acts to maintain said switch means conductive for the duration of said first tone, and said delay circuit further maintains said switch means conductive after cessation of said first tone for a period during which a second tone can be received subsequent to said first tone, said second tone operating said circuit means to maintain said switch means conductive after cessation of said second tone.
Claim 3
Dependent Claim
34 words
A receiver as claimed in claim 1, including at least one further delay circuit operated by termination of the first tone to open a circuit path and allow passage of a second subsequent tone.
Claim 4
Dependent Claim
57 words
A receiver as claimed in claim 2, wherein the opening of said tone circuit path occurs at a predetermined time after the cessation of the first tone and is of predetermined duration so that a second subsequent tone of correct frequency beginning and ending either before opening or after closure of the circuit path has no effect.
Claim 5
Dependent Claim
45 words
A receiver as claimed in claim 1, including means for feeding the successively received tones both to a first tone channel and to a second tone channel, and wherein each tone channel comprises a selective network for that tone, an amplifier and a tone detector.
Claim 6
Dependent Claim
64 words
A receiver as claimed in claim 4, wherein the output of the tone detector of one tone channel is fed as one input to an OR gate and the output of the other tone detector of the other tone channel is fed to a bistable memory circuit, said bistable memory circuit having a first output fed as a second input to the OR gate.
Claim 7
Dependent Claim
51 words
A receiver as claimed in claim 5, including means for applying the output of the OR gate to the input of a second gate and means connecting said second gate to provide a low resistance path at the input to the first delay circuit in the aBsence of receiving correct tones.
Claim 8
Dependent Claim
48 words
A receiver as claimed in claim 6, including a third gate connected to selectively provide a short circuit at the input of the second tone channel and a fourth gate fed from a second output of the bistable memory circuit provides a short circuit in the audio channel.
Claim 9
Dependent Claim
60 words
A receiver as claimed in claim 7, wherein a receiver carrier modulated with a tone of a correct frequency is rectified by the tone detector of one of the tone detector channels thereby changing the state of the OR gate and opening the second gate to charge the capacitor of the first delay circuit and hold the switch means conductive.
Claim 10
Dependent Claim
35 words
A receiver as claimed in claim 8, wherein the capacitor of the delay circuit is connected via an inverter to open the third gate to allow the passage of signals to the second tone channel.
Claim 11
Dependent Claim
46 words
A receiver as claimed in claim 8, wherein the first tone channel feeds the input of a delay gate, which operates a predetermined time after cessation of a first tone to open the third gate to allow the passage of signals to the second tone channel.
Claim 12
Dependent Claim
46 words
A receiver as claimed in claim 8, wherein upon receipt of a second tone during the period in which the third gate is open, the bistable memory circuit changes its state and opens the fourth gate to allow passage of audio signals through the audio channel.
Claim 13
Dependent Claim
49 words
A receiver as claimed in claim 11, wherein the bistable memory circuit holds the audio circuit open after cessation of the second tone until operation of a manual switch which causes the bistable memory circuit to revert to its initial condition and return the switch means to periodic switching.
Claim 14
Dependent Claim
44 words
A receiver as claimed in claim 12, wherein if no second tone is received while the third gate is open, said switch means resumes periodic switching at a short time interval after cessation of the first tone, as determined by said first delay circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |