US3611156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery economy apparatus
Assignee: Pye Electronic Products Ltd
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Filing: 1968-11-18
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Granted: 1971-10-05
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Expires: 1988-11-18
Abstract
Abstract This invention provides a battery economizer circuit, particularly for a tone call radio receiver, wherein a multivibrator controls a semiconductor switch device for rendering the direct-current path to the receiver alternately conductive and nonconductive and the multivibrator has a repetition rate which may be altered, but in which the mark/space ratio remains substantially constant irrespective of the repetition rate.
Inventors
- 👤 Michael H E Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:09
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0211; H03F1/0216; H03F1/0222; H03F1/0244
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A battery economizer circuit for obtaining reduced power consumption from the battery supply to a radio receiver in the absence of an incoming signal including a semiconductor switch device for rendering a direct-current path from the battery to the receiver alternately conductive and nonconductive, a multivibrator circuit for controlling the switching of said switch device, said multivibrator circuit including two semiconductor devices and two serially connected capacitors used as the frequency-determining capacitance of said multivibrator circuit and connected between the corresponding electrodes of said two semiconductor devices, means for short circuiting one of said capacitors, upon receipt of a carrier wave signal, to lower the repetition rate of said multivibrator circuit whilst maintaining the mark/space ratio substantially constant and means for maintaining said switch device in the conductive position upon receipt of a predetermined tone modulation of said carrier.
Claim 2
Dependent Claim
139 words
A battery economizer circuit for obtaining reduced power consumption from the battery supply to a radio receiver in the absence of an incoming signal including a semiconductor switch device for rendering a direct-current path from the battery to the receiver alternately conductive and nonconductive, a multivibrator circuit for controlling the switching of said switch device, said multivibrator circuit including two semiconductor devices and two serially connected capacitors used as the frequency-determining capacitance of said multivibrator circuit and connected between the corresponding electrodes of said two semiconductor devices, means for short circuiting one of said capacitors, upon receipt of a carrier wave signal, to lower the repetition rate of said multivibrator circuit whilst maintaining the mark/space ratio substantially constant and means for maintaining said switch device in the conductive position upon receipt of a predetermined tone modulation of said carrier.
Claim 3
Dependent Claim
52 words
A circuit as claimed in claim 1, wherein said means for short circuiting said one capacitor comprises a further semiconductor device connected across said capacitor, and means for applying a control voltage derived from said received carrier wave signal to an electrode of said further semiconductor device to produce said short circuIt.
Claim 4
Dependent Claim
72 words
A circuit as claimed in claim 2 comprising means for rectifying a part the noise signal generated in the receiver in the absence of a received signal and means for applying the rectified signal as the control voltage to the control electrode of said further semiconductor device to hold it in a high resistance condition so that the two capacitors are effectively in series and the multivibrator has a high repetition rate.
Claim 5
Dependent Claim
68 words
A receiver as claimed in claim 1, including an electronic switch, a bistable toggle circuit and an audio amplifier and wherein the receipt of said predetermined tone modulation operates said bistable toggle circuit to close said electronic switch to pass said tone modulation to said audio amplifier, and a locking device also operated by the receipt of said predetermined tone modulation to hold said switching device continuously conductive.
Claim 6
Dependent Claim
57 words
A receiver as claimed in claim 4, including a manually operated reset switch effective to reset said bistable toggle circuit and open the electronic switch and thereby render the audio amplifier inoperative; and also effective to cause said switching device to revert to its faster speed which it assumes in the absence of a received carrier signal.
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) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |