Patent US397998A successfully refreshed from Google Patents.
US3801799A
Expired / Lapsed
US
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Capacitance and resistance-responsive control circuits
Assignee: Cooper Industries LLC
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Filing: 1972-08-14
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Granted: 1974-04-02
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Expires: 1992-08-14
Abstract
Abstract Control circuits for sensing and responding to impedance changes caused by a mammal in contact with or in proximity to an antenna or other sensor. Each circuit includes at least one tuned circuit which is periodically energized to cause it to ''''ring'''' at its natural frequency, i.e., to produce damped oscillations. Each tuned circuit includes an antenna or other sensor by which an external impedance is coupled to the tuned circuit. Thus, the oscillations in the tuned circuit are attenuated to a degree determined by the capacitive and resistive components of the external impedance. In the case of mammals, the resistive component is substantial and causes a marked change in the amplitude and duration of the damped oscillations in the tuned circuit, which are then enhanced and/or detected to produce a predetermined control signal.
Inventors
- 👤 C Atkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:02
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/945
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
61 words
A control circuit comprising: 1. first means operative to generate energizing pulses; and 2. second means operative to receive said energizing pulses and to produce oscillations during each interpulse period, said second means being further operative to sense the coupling thereto of an external impedance having a substantial capacitive or resistive component and to attenuate said interpulse oscillations in response thereto.
Claim 2
Dependent Claim
61 words
A control circuit comprising: 1. first means operative to generate energizing pulses; and 2. second means operative to receive said energizing pulses and to produce oscillations during each interpulse period, said second means being further operative to sense the coupling thereto of an external impedance having a substantial capacitive or resistive component and to attenuate said interpulse oscillations in response thereto.
Claim 3
Dependent Claim
20 words
The circuit according to claim 1 further comprising detection means operative to detect said interpulse oscillations of said second means.
Claim 4
Dependent Claim
47 words
second means operative to receive said energizing pulses and to produce oscillations during each interpulse period, said second means being further operative to sense the coupling thereto of an external impedance having a substantial capacitive or resistive component and to attenuate said interpulse oscillations in response thereto.
Claim 5
Dependent Claim
47 words
second means operative to receive said energizing pulses and to produce oscillations during each interpulse period, said second means being further operative to sense the coupling thereto of an external impedance having a substantial capacitive or resistive component and to attenuate said interpulse oscillations in response thereto.
Claim 6
Dependent Claim
18 words
isolating means operative to decouple said first and second means during each negative-going portion of said energizing voltage.
Claim 7
Dependent Claim
18 words
isolating means operative to decouple said first and second means during each negative-going portion of said energizing voltage.
Claim 8
Dependent Claim
22 words
bias means operative to generate a negative signal during said interpulse periods during which said energizing voltage is at approximately ground potential.
Claim 9
Dependent Claim
22 words
bias means operative to generate a negative signal during said interpulse periods during which said energizing voltage is at approximately ground potential.
Claim 10
Dependent Claim
34 words
a bias circuit comprising a first resistance and a first capacitance connected in parallel with one another and in series between the output of said pulse generator and one terminal of a stored-charge diode;
Claim 11
Dependent Claim
34 words
a bias circuit comprising a first resistance and a first capacitance connected in parallel with one another and in series between the output of said pulse generator and one terminal of a stored-charge diode;
Claim 12
Dependent Claim
22 words
bias means operative to generate a positive signal during said interpulse periods during which said energizinG voltage is at approximately ground potential.
Claim 13
Dependent Claim
22 words
bias means operative to generate a positive signal during said interpulse periods during which said energizinG voltage is at approximately ground potential.
Claim 14
Dependent Claim
27 words
a tuned circuit operative to receive the output of said bias means and including a sensor by means of which said coupling of external impedances is effected;
Claim 15
Dependent Claim
27 words
a tuned circuit operative to receive the output of said bias means and including a sensor by means of which said coupling of external impedances is effected;
Claim 16
Dependent Claim
37 words
first signal channel means operative to receive said energizing voltage, and to sense the coupling of an external impedance having a substantial capacitive or resistive component and to generate a predetermined output signal in response thereto; and
Claim 17
Dependent Claim
37 words
first signal channel means operative to receive said energizing voltage, and to sense the coupling of an external impedance having a substantial capacitive or resistive component and to generate a predetermined output signal in response thereto; and
Claim 18
Dependent Claim
36 words
second signal channel means operative to receive said energizing voltage, and to sense the coupling of an external impedance having a substantial capacitive or resistive component and to generate a predetermined output signal in response thereto.
Claim 19
Dependent Claim
36 words
second signal channel means operative to receive said energizing voltage, and to sense the coupling of an external impedance having a substantial capacitive or resistive component and to generate a predetermined output signal in response thereto.
Claim 20
Dependent Claim
69 words
a tuned circuit comprising an inductance, a second capacitance and an antenna connected in parallel with one another and to said bias circuit at the other terminal of said stored-charge diode so as to produce oscillations during the time periods between pulses from said pulse generator, and to sense the coupling of an external impedance having a substantial capacitive or resistive component to said antenna by attenuating said oscillations;
Claim 21
Dependent Claim
69 words
a tuned circuit comprising an inductance, a second capacitance and an antenna connected in parallel with one another and to said bias circuit at the other terminal of said stored-charge diode so as to produce oscillations during the time periods between pulses from said pulse generator, and to sense the coupling of an external impedance having a substantial capacitive or resistive component to said antenna by attenuating said oscillations;
Claim 22
Dependent Claim
14 words
enhancing means operative to receive and amplify the output of said tuned circuit; and
Claim 23
Dependent Claim
14 words
enhancing means operative to receive and amplify the output of said tuned circuit; and
Claim 24
Dependent Claim
14 words
The circuit according to claim 2 wherein said detection means comprises a peak detector.
Claim 25
Dependent Claim
20 words
The circuit according to claim 1 further comprising enhancing means operative to enhance said interpulse oscillations of said second means.
Claim 26
Dependent Claim
21 words
detection means operative to detect the output of said enhancing means and to generate said predetermined control signal in response thereto.
Claim 27
Dependent Claim
21 words
detection means operative to detect the output of said enhancing means and to generate said predetermined control signal in response thereto.
Claim 28
Dependent Claim
9 words
a shock-excited oscillator connected to said tuned circuit; and
Claim 29
Dependent Claim
9 words
a shock-excited oscillator connected to said tuned circuit; and
Claim 30
Dependent Claim
18 words
a detector circuit for generating a control signal in response to a predetermined output signal from said oscillator.
Claim 31
Dependent Claim
18 words
a detector circuit for generating a control signal in response to a predetermined output signal from said oscillator.
Claim 32
Dependent Claim
25 words
The circuit according to claim 4 wherein said enhancing means comprises an oscillator circuit responsive to changes in the interpulse oscillations of said second means.
Claim 33
Dependent Claim
44 words
The circuit according to claim 5 wherein said oscillator circuit is oPerative to provide a oscillatory output voltage combined with a DC output voltage in response to said coupling of an external impedance having a substantial capacitive or resistive component to said second means.
Claim 34
Dependent Claim
36 words
The circuit according to claim 4 further comprising detection means operative to detect said interpulse oscillations of said second means after enhancement by said enhancing means and to generate a predetermined control signal in response thereto.
Claim 35
Dependent Claim
28 words
The circuit according to claim 7 wherein said detection means comprises a transistor circuit which is switched between conduction and non-conduction by the output of said enhancing means.
Claim 36
Dependent Claim
11 words
The circuit according to claim 1 wherein said first means comprises:
Claim 37
Dependent Claim
31 words
The circuit according to claim 9 wherein said bias means comprises a capacitance and resistance connected in parallel, and a blocking diode connected in series with said parallel-connected resistance and capacitance.
Claim 38
Dependent Claim
11 words
The circuit according to claim 1 wherein said first means comprises:
Claim 39
Dependent Claim
14 words
The circuit according to claim 11 wherein said isolating means comprises a blocking diode.
Claim 40
Dependent Claim
25 words
The circuit according to claim 1 wherein said second means comprises a tuned circuit having a sensor by means of which said coupling is effected.
Claim 41
Dependent Claim
4 words
A control circuit comprising:
Claim 42
Dependent Claim
4 words
A control circuit comprising:
Claim 43
Dependent Claim
16 words
The circuit according to claim 14 wherein said first and second signal channel means each comprises:
Claim 44
Dependent Claim
31 words
The circuit according to claim 14 further comprising a first load circuit controlled by said first signal channel means and a second load circuit controlled by said second signal channel means.
Claim 45
Dependent Claim
22 words
The circuit according to claim 16 further comprising a third load circuit controlled by both said first and second signal channel means.
Claim 46
Dependent Claim
21 words
The circuit according to claim 14 further comprising a load circuit controlled by both said first and second signal channel means.
Claim 47
Dependent Claim
11 words
The circuit according to claim 1 wherein said first means comprises:
Claim 48
Dependent Claim
4 words
A control circuit comprising:
Claim 49
Dependent Claim
4 words
A control circuit comprising:
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |