US3569924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic detection system
Assignee: Dexter Manufacturing Co
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Filing: 1969-03-19
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Granted: 1971-03-09
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Expires: 1989-03-19
Abstract
Abstract An ultrasonic detection system having a transmitter for producing a beam and receiver for receiving and converting the beam to an electrical AC signal and for amplifying the AC signal. A detector converts the amplified AC signal to a DC voltage, and a variable sensitivity control produces a voltage pulse upon a substantial change in the amplified AC signal resulting from a sufficient temporary interruption of the beam by an intruder. A relay control selectively completes the current path between a power source and a relay with the relay control being actuated upon occurrence of the voltage pulse. The variable sensitivity control includes a potentiometer for varying the bias supplied to a transistor, transistor being biased below conduction. The detector includes means for increasing the bias supplied to the transistor above conduction upon a sufficient temporary interruption of the beam by an intruder whereupon the transistor produces the voltage pulse for actuation of the relay control. The relay control includes a silicon controlled rectifier which completes the current path through the relay upon occurrence of the voltage pulse by the transistor.
Inventors
- 👤 John E Drake
- 👤 Dexter Benner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:17
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1609; G08B13/1618
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
151 words
In an ultrasonic detection system comprising an ultrasonic beam transmitter and receiver wherein the receiver includes means for receiving the ultransonic beam and converting same to an electrical AC signal, and means for amplifying the AC signal, the improvement comprising detector means for converting the amplified AC signal to a DC voltage, selectively controlled pulsing means for producing a voltage pulse directly proportional to the amplified AC signal upon a sufficiently large change in the amplified AC signal resulting from a sufficient temporary interruption of the ultrasonic beam by an intruder, an alarm, relay means controlling the activation of said alarm, a power source connected to said relay means, selectively controlled switching means connected to the circuit with said power source and said relay means for completing the current path through said relay means upon actuation of said switching means, said switching means being actuated upon occurrence of said voltage pulse.
Claim 2
Dependent Claim
151 words
In an ultrasonic detection system comprising an ultrasonic beam transmitter and receiver wherein the receiver includes means for receiving the ultransonic beam and converting same to an electrical AC signal, and means for amplifying the AC signal, the improvement comprising detector means for converting the amplified AC signal to a DC voltage, selectively controlled pulsing means for producing a voltage pulse directly proportional to the amplified AC signal upon a sufficiently large change in the amplified AC signal resulting from a sufficient temporary interruption of the ultrasonic beam by an intruder, an alarm, relay means controlling the activation of said alarm, a power source connected to said relay means, selectively controlled switching means connected to the circuit with said power source and said relay means for completing the current path through said relay means upon actuation of said switching means, said switching means being actuated upon occurrence of said voltage pulse.
Claim 3
Dependent Claim
27 words
In the system as defined in claim 1 wherein said switching means remains actuated after reestablishment of the ultrasonic beam after the temporary interruption by the intruder.
Claim 4
Dependent Claim
109 words
In the system as defined in claim 1 wherein said selectively controlled pulsing means includes a potentiometer and a transistor, a bias supply for said transistor, said potentiometer being connected to said transistor and being variabLe to adjust the bias being supplied to said transistor from said bias supply and biasing said transistor below conduction, said detector means including means for increasing the bias being supplied to said transistor directly proportional to the amplified AC signal to render said transistor conductive upon a sufficient temporary interruption of the ultrasonic beam by an intruder whereby the output of said transistor produces said voltage pulse for actuation of said switching means.
Claim 5
Dependent Claim
47 words
In the system as defined in claim 1 wherein said selectively controlled switching means includes a silicon controlled rectifier, said voltage pulse being sufficient to raise the potential of the gate of said rectifier to cause conduction therethrough and completing the current path through said relay means.
Claim 6
Dependent Claim
145 words
In the system as defined in claim 1 wherein said selectively controlled pulsing means includes a potentiometer and a transistor, a bias supply for said transistor, said potentiometer being connected to said transistor and being variable to adjust the bias supplied to said transistor from said bias supply and maintaining the bias of said transistor below conduction, said detector means including means for increasing the bias on said transistor proportional to the amplified AC signal to render said transistor conductive upon a sufficient interruption of the ultrasonic beam by an intruder, said selectively controlled switching means including a silicon controlled rectifier, the output of said transistor being said voltage pulse which is applied to the gate of said rectifier, said voltage pulse being sufficient to raise the potential of said rectifier gate to cause conduction therethrough and completing the current path through said relay means.
Claim 7
Dependent Claim
132 words
In an ultrasonic detection system comprising an ultrasonic beam transmitter and receiver wherein the receiver includes means for receiving the ultrasonic beam and converting same to an electrical AC signal, and means for amplifying the AC signal, the improvement comprising detector means for converting the amplified AC signal to a DC voltage, a variable sensitivity control for producing a voltage pulse directly proportional to said DC voltage upon a substantial change in the amplified AC signal resulting from a sufficient temporary interruption of the ultrasonic beam by an intruder, an alarm, a relay controlling the activation of said alarm, a power source connected to said relay, a relay control for selectively completing the current path between said power source and relay, said relay control being actuated upon occurrence of said voltage pulse.
Claim 8
Dependent Claim
132 words
In an ultrasonic detection system comprising an ultrasonic beam transmitter and receiver wherein the receiver includes means for receiving the ultrasonic beam and converting same to an electrical AC signal, and means for amplifying the AC signal, the improvement comprising detector means for converting the amplified AC signal to a DC voltage, a variable sensitivity control for producing a voltage pulse directly proportional to said DC voltage upon a substantial change in the amplified AC signal resulting from a sufficient temporary interruption of the ultrasonic beam by an intruder, an alarm, a relay controlling the activation of said alarm, a power source connected to said relay, a relay control for selectively completing the current path between said power source and relay, said relay control being actuated upon occurrence of said voltage pulse.
Claim 9
Dependent Claim
27 words
In the system as defined in claim 6 wherein said relay control remains actuated after reestablishment of the ultrasonic beam after the temporary interruption by the intruder.
Claim 10
Dependent Claim
107 words
In the system as defined in claim 6 wherein said variable sensitivity control includes a potentiometer and a transistor, a bias supply for said transistor, said potentiometer being connected to said transistor and being variable to adjust the bias being supplied to said transistor from said bias supply and biasing said transistor below conduction, said detector means including means for increasing the bias being supplied to said transistor directly proportional to said DC voltage to render said transistor conductive upon a sufficient temporary interruption of the ultrasonic beam by an intruder whereby the output of said transistor produces said voltage pulse for actuation of said relay control.
Claim 11
Dependent Claim
44 words
In the system as defined in claim 6 wherein said relay control includes a silicon controlled rectifier, said voltage pulse being sufficient to raise the potential of the gate of said rectifier to cause conduction therethrough and completing the current path through said relay.
Claim 12
Dependent Claim
141 words
In the system as defined in claim 6 wherein said variable sensitivity control includes a potentiometer and a transistor, a bias supply for said transistor, said potentiometer being connected to said transistor aNd being variable to adjust the bias supplied to said transistor from said bias supply and maintaining the bias of said transistor below conduction, said detector means including means for increasing the bias on said transistor directly proportional to said DC voltage to render said transistor conductive upon a sufficient interruption of the ultrasonic beam by an intruder, said relay control including a silicon controlled rectifier, the output of said transistor being said voltage pulse which is applied to the gate of said rectifier, said voltage pulse being sufficient to raise the potential of said rectifier gate to cause conduction therethrough and completing the current path through said relay.
Claim 13
Dependent Claim
99 words
In the system as defined in claim 6 wherein said detector means includes a capacitor charged by said DC voltage, said sensitivity control comprising a bias supply, a transistor, a variable resistor connected between said bias supply and transistor for biasing said transistor below conduction, said capacitor discharging through said variable resistor for increasing the bias of said transistor above conduction upon a substantial change in the amplified signal resulting from a sufficient temporary interruption of the ultrasonic beam by an intruder, said transistor upon conduction supplying said voltage pulse at its output for actuation of said relay control.
Claim 14
Dependent Claim
71 words
In the system as defined in claim 11 wherein said relay control includes a silicon controlled rectifier, said sensitivity control further including a resistor connecting the gate of said rectifier to said bias supply, said transistor output being connected between said resistor and rectifier gate for supplying said voltage pulse to said gate to cause conduction therethrough and completing the current path through said power supply and relay for actuation thereof.
Claim 15
Dependent Claim
39 words
In the system as defined in claim 12 further comprising a capacitor connected between said gate and ground for draining the voltage from said gate after actuation thereof during resetting of the system and after actuation of said alarm.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |