US4030087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-theft alarm system
Assignee: Individual
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Filing: 1976-03-12
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Granted: 1977-06-14
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Expires: 1996-03-12
Abstract
Abstract An anti-theft alarm system is provided for detecting a desired disturbance to an associated structure wherein a momentary disturbance of the structure causes the alarm to emit a short audible warning blast and if the disturbance continues, thereafterwards, the alarm will remain on until the alarm system is deactivated.
Inventors
- 👤 Dale A. Ritchie
- 👤 Walker G. Petroff
- 👤 Roy G. Smarr, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:08
CPC Classifications
G; G08; G08B; G08B17/00; G08B13/00; G08B13/02; G08B13/14; G08B13/1436
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
323 words
In an alarm system for detecting a desired disturbance to an associated structure, said system having a buzzer for emitting an audible alarm signal in response to said detection, a d-c power source connected to said buzzer for supplying current thereto, first and second switch means connected in series with said buzzer and said power source for selectively connecting said buzzer to said power source, said first switch means being manually operated to activate said alarm system, a disturbance detecting circuit for controlling said second switch means comprising: a detection means for detecting said disturbance and producing a detection signal; a first digital logic gate means having a first input terminal coupled to said detection means for receiving said detection signal and producing a conditioned output signal of a predetermined level; a second digital logic gate means having first and second input terminals and an output terminal, said first input terminal coupled to said first logic gate means for receiving said predetermined output signal and producing an output signal of a predetermined voltage level; latch-up means coupled to said input terminal of said second logic gate for gating said second logic gate on and clamping the output terminal of said second logic gate at said predetermined voltage level when said disturbance is continued for a predetermined period of time; a third digital logic gate means providing a high gain inverting amplifier having an input coupled to the output terminal of said second logic gate means and an output terminal coupled to said second switch means; said third logic gate means inverting said predetermined output voltage of said second logic gate producing an output signal for switching said second switch means into conduction; and said buzzer emitting a short audible alarm signal when said system is activated an an initial disturbance is detected and, thereafterward, said buzzer emitting a continuous audible alarm signal when said disturbance is continued for said predetermined period of time.
Claim 2
Dependent Claim
323 words
In an alarm system for detecting a desired disturbance to an associated structure, said system having a buzzer for emitting an audible alarm signal in response to said detection, a d-c power source connected to said buzzer for supplying current thereto, first and second switch means connected in series with said buzzer and said power source for selectively connecting said buzzer to said power source, said first switch means being manually operated to activate said alarm system, a disturbance detecting circuit for controlling said second switch means comprising: a detection means for detecting said disturbance and producing a detection signal; a first digital logic gate means having a first input terminal coupled to said detection means for receiving said detection signal and producing a conditioned output signal of a predetermined level; a second digital logic gate means having first and second input terminals and an output terminal, said first input terminal coupled to said first logic gate means for receiving said predetermined output signal and producing an output signal of a predetermined voltage level; latch-up means coupled to said input terminal of said second logic gate for gating said second logic gate on and clamping the output terminal of said second logic gate at said predetermined voltage level when said disturbance is continued for a predetermined period of time; a third digital logic gate means providing a high gain inverting amplifier having an input coupled to the output terminal of said second logic gate means and an output terminal coupled to said second switch means; said third logic gate means inverting said predetermined output voltage of said second logic gate producing an output signal for switching said second switch means into conduction; and said buzzer emitting a short audible alarm signal when said system is activated an an initial disturbance is detected and, thereafterward, said buzzer emitting a continuous audible alarm signal when said disturbance is continued for said predetermined period of time.
Claim 3
Dependent Claim
66 words
In an alarm system as in claim 1 wherein said latch-up means includes a capacitor charged by the output voltage of said second logic gate means, said second logic gate output being clamped at said predetermined voltage level when said capacitor is charged to a level exceeding the gating threshold of said second input to maintain said audible alarm signal on until said circuit is de-activated.
Claim 4
Dependent Claim
76 words
In an alarm system as in claim 1 further comprising a delay circuit means coupled to said first input of said first digital logic gate means for momentarily establishing an input signal at said first input of said first gate means producing an output signal at said third gate means for switching said second switch means into conduction producing a momentary power on audible test signal from said buzzer when said first switch is initially closed.
Claim 5
Dependent Claim
49 words
In an alarm system as in claim 1 further comprising a signal conditioning network coupled between said first logic gate output and the input of said second logic gate shaping the output signal from said first logic gate means for fast and accurate switching of said second gate means.
Claim 6
Dependent Claim
41 words
In an alarm system as in claim 1 further comprising a delay circuit means coupled to the output of said second gate means and a second input of said first gate means for reducing vibrational feedback from said buzzer when energized.
Claim 7
Dependent Claim
223 words
An alarm system for detecting a desired disturbance condition to an associated structure having a buzzer for emitting an audible alarm signal in response to said disturbance, a d-c power source connected to said buzzer for supplying current thereto, first and second switch means connected in series with said buzzer and said power source for selectively connecting said buzzer to said power source, said first switch means being manually operated to activate said alarm system, and a disturbance detecting circuit for controlling said second switch means comprising a detection means for detecting said disturbance and producing a detection signal, logic gate means having a first and second input terminal and an output terminal, said first input terminal being connected to said detection means for receiving said detection signal and producing an output voltage of a predetermined level, latch-up means coupled to said second input terminal of said logic gate means for gating said logic gate means on and clamping said output terminal of said logic gate means at a predetermined voltage level when said disturbance continues for a predetermined duration of time, said second switch means including a semi-conductor switch means coupled to said output terminal of said logic gate means responsive to said predetermined voltage level for connecting said buzzer to said power source whereby said buzzer emits said audible alarm signal.
Claim 8
Dependent Claim
223 words
An alarm system for detecting a desired disturbance condition to an associated structure having a buzzer for emitting an audible alarm signal in response to said disturbance, a d-c power source connected to said buzzer for supplying current thereto, first and second switch means connected in series with said buzzer and said power source for selectively connecting said buzzer to said power source, said first switch means being manually operated to activate said alarm system, and a disturbance detecting circuit for controlling said second switch means comprising a detection means for detecting said disturbance and producing a detection signal, logic gate means having a first and second input terminal and an output terminal, said first input terminal being connected to said detection means for receiving said detection signal and producing an output voltage of a predetermined level, latch-up means coupled to said second input terminal of said logic gate means for gating said logic gate means on and clamping said output terminal of said logic gate means at a predetermined voltage level when said disturbance continues for a predetermined duration of time, said second switch means including a semi-conductor switch means coupled to said output terminal of said logic gate means responsive to said predetermined voltage level for connecting said buzzer to said power source whereby said buzzer emits said audible alarm signal.
Claim 9
Dependent Claim
92 words
The alarm system as set forth in claim 6 further comprising delay circuit means coupled to said first input terminal of said logic gate means for momentarily establishing an input signal at said first input terminal at the moment that said first switch means is initially closed for momentarily gating on said logic gate means and thus producing a momentary output signal of a predetermined voltage level for switching said semi-conductor switch means to produce a momentary power on audible test signal from said buzzer when said first switch is initially closed.
Claim 10
Dependent Claim
57 words
The alarm system as set forth in claim 6 wherein said buzzer emits a short audible alarm signal when said system is activated by closure of said first switch means and an initial disturbance is detected, and, thereafterwards said buzzer emits a continuous audible alarm signal when said disturbance is continued for said predetermined duration of time.
References Cited (Backward Citations)
US3828338A
Cited
US3713128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |