Patent US3697975A successfully refreshed from Google Patents.
US3697975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remotely controlled switching system
Assignee: Safety Signaling Inc
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Filing: 1969-08-06
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Granted: 1972-10-10
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Expires: 1989-08-06
Abstract
Abstract A remotely controlled switching system comprising a transmitter having a power source including the charge on a capacitor thereby to provide a limited duration output signal. As the charge on the capacitor decays, the frequency of the transmitter output signal increases a predetermined amount. The receiver associated with the transmitter includes a tuned circuit which may include a piezo-electric crystal. As the transmitter signal frequency increases due to the discharge of the power supply capacitor, the signal frequency passes through the series resonant frequency as well as the parallel resonant frequency of the crystal. Thus, the receiver need not be fine tuned to a particular frequency to receive the output of a particular oscillator. Moreover, the receiver contains a circuit which prevents stray or transient signals from prematurely triggering its output circuit. The receiver output circuit includes means responsive to limited duration signals which means retains its status until definitely changed.
Inventors
- 👤 Karl Bernstein
- 👤 E Richard Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:21
CPC Classifications
H; H02; H02J; H02J13/00; H02J13/13; H02J13/1311; H02J13/1313; Y; Y02; Y02E; Y02E60/00; Y04; Y04S; Y04S40/00; Y04S40/12; Y04S40/121
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
124 words
A switching system for generating and transmitting high frequency signals over a relatively low frequency power system comprising: actuating switch means; generating means responsive to actuation of said actuating switch means, said generating means including oscillator means for generating a single pulse of high frequency energy having a predetermined duration; a capacitor; means for charging said capacitor; means connecting said capacitor to said generating means; the charge on said capacitor providing the only power for said generating means, said duration being determined by the decay of voltage across a capacitor, the frequency of said energy changing during the duration thereof responsive to the decay of said voltage; and coupling means for coupling said pulse of energy from said generating means to said power system.
Claim 2
Dependent Claim
124 words
A switching system for generating and transmitting high frequency signals over a relatively low frequency power system comprising: actuating switch means; generating means responsive to actuation of said actuating switch means, said generating means including oscillator means for generating a single pulse of high frequency energy having a predetermined duration; a capacitor; means for charging said capacitor; means connecting said capacitor to said generating means; the charge on said capacitor providing the only power for said generating means, said duration being determined by the decay of voltage across a capacitor, the frequency of said energy changing during the duration thereof responsive to the decay of said voltage; and coupling means for coupling said pulse of energy from said generating means to said power system.
Claim 3
Dependent Claim
51 words
A switching system as defined in claim 1 in which said generating means includes at least one oscillator means and an amplifier means, and isolating switch means coupling said oscillator means to said amplifier means, said switch means being closed only in response to an output signal from said oscillator means.
Claim 4
Dependent Claim
28 words
A switching system as defined in claim 2 in which said isolating switch means is a diode connected to be forward biased by said oscillator means output signal.
Claim 5
Dependent Claim
25 words
A switching system as defined in claim 2 in which said amplifier means is non-conducting except during the time said isolating switch means is closed.
Claim 6
Dependent Claim
34 words
A switching system as defined in claim 3 including a plurality of oscillator means, each tuned to generate a pulse of energy having a different frequency and each including means for individual control thereof.
Claim 7
Dependent Claim
31 words
A switching system as defined in claim 1 further including receiver means responsive only to a portion of said pulse of energy and means coupling said receiver to said power system.
Claim 8
Dependent Claim
36 words
A switching system as defined in claim 6 which further includes bistable means responsive to said portion of said signal received by said receiver means to change from one of its stable states to the other.
Claim 9
Dependent Claim
17 words
A switching system as defined in claim 7 in which said bistable means is a pulse relay.
Claim 10
Dependent Claim
180 words
A switching means for generating and transmitting high frequency signals over a relatively low frequency power system comprising: a direct current power supply; means for generating a single pulse high frequency signal responsive to application of a source of power thereto, said generating means including oscillator means; a capacitor coupled to said generating means; momentary closure switch means coupled to said capacitor for coupling said power supply to said capacitor thereby to apply a charge thereto upon closure of said switch means, said charge on said capacitor forming the only power source for said generating means; said generating means being coupled to said low frequency power system thereby applying said high frequency signal to said poWer system, the frequency of the signal increasing as the voltage across said capacitor decays; a receiver coupled to said low frequency power system, said receiver having a tuned circuit at the input thereof tuned to the high frequency signals of said transmitter, said tuned circuit including frequency responsive means having a resonant frequency falling within those frequencies through which said generating means signal sweeps.
Claim 11
Dependent Claim
180 words
A switching means for generating and transmitting high frequency signals over a relatively low frequency power system comprising: a direct current power supply; means for generating a single pulse high frequency signal responsive to application of a source of power thereto, said generating means including oscillator means; a capacitor coupled to said generating means; momentary closure switch means coupled to said capacitor for coupling said power supply to said capacitor thereby to apply a charge thereto upon closure of said switch means, said charge on said capacitor forming the only power source for said generating means; said generating means being coupled to said low frequency power system thereby applying said high frequency signal to said poWer system, the frequency of the signal increasing as the voltage across said capacitor decays; a receiver coupled to said low frequency power system, said receiver having a tuned circuit at the input thereof tuned to the high frequency signals of said transmitter, said tuned circuit including frequency responsive means having a resonant frequency falling within those frequencies through which said generating means signal sweeps.
Claim 12
Dependent Claim
17 words
A switching system in accordance with claim 9 wherein said frequency responsive means comprises a piezo-electric crystal.
Claim 13
Dependent Claim
148 words
A signal system for use with a relatively low frequency power system comprising a transmitter for generating a varying frequency high frequency signal energy pulse over said low frequency power system, said transmitter including at least one oscillator means and an amplifier means, and isolating switch means coupling said oscillator means to said amplifier means, said switch means being closed only in response to an output signal from said oscillator means, and at least one pulse responsive receiver coupled to said power system, said receiver including tuned circuit means having a resonant frequency falling within the frequency range of said varying frequency of said high frequency generated signal, first means actuated by at least a portion of said varying high frequency signal energy pulse, and second means manually actuated whereby apparatus coupled to said receiver may be effected by actuation of either of said first and second means.
Claim 14
Dependent Claim
148 words
A signal system for use with a relatively low frequency power system comprising a transmitter for generating a varying frequency high frequency signal energy pulse over said low frequency power system, said transmitter including at least one oscillator means and an amplifier means, and isolating switch means coupling said oscillator means to said amplifier means, said switch means being closed only in response to an output signal from said oscillator means, and at least one pulse responsive receiver coupled to said power system, said receiver including tuned circuit means having a resonant frequency falling within the frequency range of said varying frequency of said high frequency generated signal, first means actuated by at least a portion of said varying high frequency signal energy pulse, and second means manually actuated whereby apparatus coupled to said receiver may be effected by actuation of either of said first and second means.
Claim 15
Dependent Claim
20 words
A signal system as defined in claim 11 wherein said receiver replaces a wall switch in an electrical wiring 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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |