US3579240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective radio receiver system
Assignee: Philips Home Products Inc
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Filing: 1968-04-30
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Granted: 1971-05-18
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Expires: 1988-04-30
Abstract
Abstract The disclosure shows a remotely controlled radio receiver circuit which may be used to control a garage door operator, for example, from a low-power remote transmitter. The signal emitted by the transmitter includes a carrier as modulated by a lower frequency, for example an audiofrequency, which signal is amplified in the receiver, detected and supplied to an audiofrequency resonant load and to a resistance load. These two loads are connected in opposition so that if the received signal is of the proper carrier frequency to be amplified and passed through the first stages of the receiver and if the audiofrequency is of the proper preselected frequency to be resonated by the audiofrequency resonant circuit, a resonant voltage signal is passed. A first time delay capacitor is connected in a circuit to give only time delay of turn turn-on of a load relay, and a second time delay capacitor is connected in circuit to give only time delay of dropout of the relay, and in this manner telemetering or other relatively rapid pulsed signals, even of the proper carrier and audiofrequencies, do not actuate the relay. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
Inventors
- 👤 Andrew F Deming
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:56
CPC Classifications
G; G08; G08C; G08C19/00; G08C19/12
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
85 words
A radio receiver system for receiving a given frequency signal and subject to random noise, comprising, in combination, amplifier means for said given frequency signal, detector means having an input from the output of said amplifier means and having an output terminal, a relay, means connecting the output terminal of said detector means to said relay to control the energization of said relay, and first means connected in circuit with said detector means to delay only the pull-in but not the dropout of said relay.
Claim 2
Dependent Claim
85 words
A radio receiver system for receiving a given frequency signal and subject to random noise, comprising, in combination, amplifier means for said given frequency signal, detector means having an input from the output of said amplifier means and having an output terminal, a relay, means connecting the output terminal of said detector means to said relay to control the energization of said relay, and first means connected in circuit with said detector means to delay only the pull-in but not the dropout of said relay.
Claim 3
Dependent Claim
62 words
A radio receiver system as set forth in claim 1 wherein said first means includes a time delay capacitor, means connecting said time delay capacitor in said first means to be charged by the detector means output, and means responsive to one of the charging and discharging time of said time delay capacitor to establish the delay of pull-in of said relay.
Claim 4
Dependent Claim
73 words
A radio receiver system as set forth in claim 2, including means connecting said time delay capacitor in circuit with said detector means output to be charged in one polarity and after the time delay of charging to establish pull-in of said relay, impedance means to discharge said capacitor, and a unidirectional current device connected in circuit with said time delay capacitor to prevent discharge thereof in a direction maintaining said relay energized.
Claim 5
Dependent Claim
25 words
A radio receiver system as set forth in claim 1, including, a second means to delay the dropout but not the pull-in of said relay.
Claim 6
Dependent Claim
54 words
A radio receiver system as set forth in claim 4, wherein said second means includes, a second time delay capacitor, charging means for said second time delay capacitor, and means responsive to one of the charging and discharging time of said second time delay capacitor to establish the delay of dropout of said relay.
Claim 7
Dependent Claim
57 words
A radio receiver system as set forth in claim 5 including a DC power supply in said system, said charging means deriving energy from said DC power supply to charge said second time delay capacitor, and means responsive to the charging current through said second time delay capacitor to establish the delay of dropout of said relay.
Claim 8
Dependent Claim
49 words
A radio receiver system as set forth in claim 6 including a transistor connected in circuit with said relay, and means responsive to the charging current through said second time delay capacitor to maintain said transistor in a conducting condition to establish the delay of dropout of said relay.
Claim 9
Dependent Claim
40 words
A radio receiver system as set forth in claim 5 including contact means actuated by said relay, and means controlling said charging means for said second time delay capacitor in accordance with actuation of said contact means of said relay.
Claim 10
Dependent Claim
177 words
A radio receiver system for receiving a given frequency signal and subject to random noise, comprising in combination, amplifier means for said given frequency signal, detector means having an input from the output of said amplifier means, said detector means including a first unidirectional current device conNected to supply voltage of one polarity to a detector output terminal, a time delay capacitor connected to said detector output terminal with said first device poled to conduct current to charge said capacitor of said one polarity on said detector output terminal upon passage of current by said first device in accordance with a detected given frequency signal, a relay having a winding, first means connected to energize said relay winding upon charge of said time delay capacitor, and a second unidirectional current device connected in circuit with said time delay capacitor and poled to conduct current in the same direction as said first device but not in the opposite direction to thereby immediately terminate the means to energize said relay winding upon termination of said detected given frequency signal.
Claim 11
Dependent Claim
177 words
A radio receiver system for receiving a given frequency signal and subject to random noise, comprising in combination, amplifier means for said given frequency signal, detector means having an input from the output of said amplifier means, said detector means including a first unidirectional current device conNected to supply voltage of one polarity to a detector output terminal, a time delay capacitor connected to said detector output terminal with said first device poled to conduct current to charge said capacitor of said one polarity on said detector output terminal upon passage of current by said first device in accordance with a detected given frequency signal, a relay having a winding, first means connected to energize said relay winding upon charge of said time delay capacitor, and a second unidirectional current device connected in circuit with said time delay capacitor and poled to conduct current in the same direction as said first device but not in the opposite direction to thereby immediately terminate the means to energize said relay winding upon termination of said detected given frequency signal.
Claim 12
Dependent Claim
32 words
A radio receiver system as set forth in claim 9 including said second unidirectional current device being connected in series with said time delay capacitor across the output of said detector means.
Claim 13
Dependent Claim
93 words
A radio receiver system as set forth in claim 9 wherein said receiver system is adapted to receive an RF carrier modulated by a given audiofrequency signal and subject to interfering telemetering signals including, a superregenerative circuit as part of said amplifier means, said superregenerative circuit having a high gain to amplify any noise and any telemetering signals to a large extent, said detector means including resonant frequency means resonant to said given frequency signal to establish a large resonant voltage signal on said detector output terminal compared to the noise signal thereon.
Claim 14
Dependent Claim
129 words
A radio receiver system as set forth in claim 9 wherein said detector means includes a first detector diode as said first unidirectional current device, resonant frequency means connected to said first detector diode to supply thereto a resonant voltage signal dependent primarily on the detection of said given frequency signal, a second detector diode, a resistor connected to said second detector diode to supply thereto a voltage dependent upon all detected signals and primarily said random noise. means in said detector means effectively connecting in series opposition the voltages on the outputs of said first and second detector diodes so that the voltage applied to said detector output terminal is passed only upon the voltage from said resonant voltage signal exceeding the voltage from said second detector diode.
Claim 15
Dependent Claim
63 words
A radio receiver system as set forth in claim 9 including means connecting said time delay capacitor to be directly energizable by said first unidirectional current device, and means connecting said second unidirectional current device to prevent a discharge of said time delay capacitor to said detector output terminal to thus prevent passing a signal to said means to energize said relay winding.
Claim 16
Dependent Claim
32 words
A radio receiver system as set forth in claim 9 including discharge means connected to said time delay capacitor to discharge same other than through said means to energize said relay winding.
Claim 17
Dependent Claim
22 words
A radio receiver system as set forth in claim 9 including a discharge resistor connected in parallel with said time delay capacitor.
Claim 18
Dependent Claim
31 words
A radio receiver as set forth in claim 9 including a second means to energize said relay winding connected effectively in parallel with said first means to energize said relay winding.
Claim 19
Dependent Claim
65 words
A radio receiver system as set forth in claim 16 wherein said second means to energize said relay winding includes a bleeder resistor and a second capacitor, means to charge said second capacitor through said bleeder resistor with a predetermined second time delay, and means controlled by the energization of said relay winding to commence operation of said second means to energize said relay winding.
Claim 20
Dependent Claim
50 words
A radio receiver system as set forth in claim 17 including a DC power supply, means to supply charging current through said bleeder resistor and seCond capacitor from said DC power supply, and contact means controlled by said relay winding to establish operation of said charging of said second capacitor.
Claim 21
Dependent Claim
31 words
A radio receiver system as set forth in claim 18 wherein said contact means is a single pole double throw contact with normally closed contacts controlling charging of said second capacitor.
Claim 22
Dependent Claim
41 words
A radio receiver system as set forth in claim 16 including a transistor having an input controlled by said first and second means to energize said relay winding, and means connecting the output of said transistor to energize said relay winding.
Claim 23
Dependent Claim
105 words
A radio receiver system as set forth in claim 9 including a transistor connected as said first means to energize said relay winding, a bleeder resistor and a second capacitor connected in series and to said transistor as a second means to energize said relay winding, and means to charge said second capacitor through said bleeder resistor whereby during the charge period of said second capacitor said transistor is turned on and after the charging is completed the transistor is no longer maintained turned on thereby so that instant recontrol of the radio receiver system is achieved upon termination of the detected given frequency signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |