US3680073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intrusion alarm system
Assignee: ELECTRO SECURITY DEVICES
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Filing: 1970-02-18
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Granted: 1972-07-25
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Expires: 1990-02-18
Abstract
Abstract An intrusion alarm system for monitoring a spacial zone to detect the occurrence of movement of an object within the zone consists of an oscillator providing R.F. signals from a radiating antenna coupled to the oscillator to propagate an R.F. field of signals within the zone being monitored, and a chassis having a portion shielded from the R.F. propagation of the antenna and disposed adjacent the antenna. The system further includes a receiving antenna adjacent the chassis for receiving the signals and modulations thereof caused by movement of an object within the field. A high gain amplifier, carried by the shielded portion of the chassis, amplifies the modulations of the received signals. Detecting means coupled to the amplifier provides an output signal in response to the amplified modulations. The output signal is adapted to activate means for manifesting occurrence of a moving object within the zone. Both local and remote alarms are actuated by the detecting system, the remote alarm being actuated only upon the occurrence of a predetermined number of detected movements.
Inventors
- 👤 Harold D Humphrey
- 👤 Richard O Juengel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:13
CPC Classifications
G; G08; G08B; G08B25/00; G08B25/008
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
In an alarm system for monitoring a spacial zone to detect the occurrence of movement of an object therein, R.F. oscillator means for providing R.F. signals a one-half wave length, centerfed dipole radiating antenna means coupled to said oscillator means to propagate an R.F. field of said signals in said zone to be monitored, a chassis having a portion shielded from the R.F. propagation of the antenna and disposed adjacent said antenna, a receiving antenna adjacent said chassis for receiving said signals and modulations thereof caused by movement of said object within said field, high gain amplifier means carried by said chassis portion for amplifying modulations of the received signals, detecting means operably coupled to said amplifier means and carried by said chassis to provide an output signal in response to said amplified modulations, said output signal being adapted to activate means for manifesting occurrence of the moving object within said zone.
Claim 2
Dependent Claim
152 words
In an alarm system for monitoring a spacial zone to detect the occurrence of movement of an object therein, R.F. oscillator means for providing R.F. signals a one-half wave length, centerfed dipole radiating antenna means coupled to said oscillator means to propagate an R.F. field of said signals in said zone to be monitored, a chassis having a portion shielded from the R.F. propagation of the antenna and disposed adjacent said antenna, a receiving antenna adjacent said chassis for receiving said signals and modulations thereof caused by movement of said object within said field, high gain amplifier means carried by said chassis portion for amplifying modulations of the received signals, detecting means operably coupled to said amplifier means and carried by said chassis to provide an output signal in response to said amplified modulations, said output signal being adapted to activate means for manifesting occurrence of the moving object within said zone.
Claim 3
Dependent Claim
102 words
In an intrusion alarm system according to claim 1 further including first and second alarm means coupled to receive said output signal and provide a manifestation of the existence of the moving object within said zone, and counting means disposed between said first and second alarm means for counting each successive output signal occurring within a predetermined time period, said first alarm means being operated by each of said output signals and said second alarm means being operably coupled to said counting means to be operated by said counting means upon occasion of registering a predetermined count therein by said counting means.
Claim 4
Dependent Claim
44 words
In an intrusion alarm system according to claim 1 further including a hot carrier diode interposed between said receiving antenna and said high gain amplifier for responding to UHF frequencies while reducing noise with respect to said modulations and radiation pattern of said field.
Claim 5
Dependent Claim
27 words
In an intrusion alarm system according to claim 1 wherein said oscillator means and broadcast antenna serve to propagate an R.F. field of 0.9 to 1.5 GHz.
Claim 6
Dependent Claim
131 words
In an intrusion alarm system of a type for monitoring modulations of an R.F. field within a spacial zone under surveillance, means providing an output signal in response to detection of a first movement of an object within the zone, said means requiring a predetermined threshold voltage in order to provide said output signal, alarm means responsively coupled to be activated by said output signal and manifesting the occurrence of said movement, and means operatively responsive to said output signal and coupled to the first named said means serving to reduce said threshold voltage for a predetermined period of time in response to said output signal to more readily activate the first named said means thereafter in response to movement of an object in said zone during said period of time.
Claim 7
Dependent Claim
131 words
In an intrusion alarm system of a type for monitoring modulations of an R.F. field within a spacial zone under surveillance, means providing an output signal in response to detection of a first movement of an object within the zone, said means requiring a predetermined threshold voltage in order to provide said output signal, alarm means responsively coupled to be activated by said output signal and manifesting the occurrence of said movement, and means operatively responsive to said output signal and coupled to the first named said means serving to reduce said threshold voltage for a predetermined period of time in response to said output signal to more readily activate the first named said means thereafter in response to movement of an object in said zone during said period of time.
Claim 8
Dependent Claim
117 words
In an intrusion alarm system of a type for monitoring modulations of an R.F. field within a spacial zone under surveillance, means providing an output signal in response to detection of a first modulation of said field, said means including means requiring a predetermined threshold voltage to provide said output signal, alarm means responsively coupled to be activated by said output signal and manifesting the occurrence of said detection, and means operably responsive to said output signal and coupled to the first named said means serving to reduce said required threshold voltage in response to said output signal to more readily activate the first named said means thereafter in response to subsequent modulation of said R.F. field.
Claim 9
Dependent Claim
117 words
In an intrusion alarm system of a type for monitoring modulations of an R.F. field within a spacial zone under surveillance, means providing an output signal in response to detection of a first modulation of said field, said means including means requiring a predetermined threshold voltage to provide said output signal, alarm means responsively coupled to be activated by said output signal and manifesting the occurrence of said detection, and means operably responsive to said output signal and coupled to the first named said means serving to reduce said required threshold voltage in response to said output signal to more readily activate the first named said means thereafter in response to subsequent modulation of said R.F. field.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |