US4237450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Appliance theft alarm
Assignee: Individual
•
Filing: 1978-11-13
•
Granted: 1980-12-02
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Expires: 1998-11-13
Abstract
Abstract An appliance theft alarm for mounting on or inside an electrical appliance which, when the electrical plug connecting the appliance with a wall electrical outlet is removed, will sound an audible alarm in order that the theft may be detected. Specifically, electrical apparatus is interconnected so that the electrical power cord running between the electrical appliance and the electrical wall outlet is sensed for the presence of electrical voltage, where when the electrical voltage is present, a relay is energized to inhibit the alarm circuit. When electrical voltage is removed, the relay becomes unenergized and in doing so, completes an electrical circuit for a self-contained battery to power an electrical horn or siren alarm. The battery is provided with a battery charger which is supplied ac current from the electrical line input. Additionally, a key controlled contact is provided to inhibit the alarm circuitry when desired or to interrupt the alarm when sounding. Relay lock-up means are also provided to prevent the alarm from being turned off, once sounded, by merely replugging the appliance's electrical plug into the wall.
Inventors
- 👤 Antonio R. Canez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1409
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
213 words
An electrical appliance theft alarm for installation on an appliance for detection of the removal of the electrical power through the appliance associated electrical power cord from an electrical power source comprising a warning sound device an electrical battery for powering said warning sound device, and a first relay and a latch-up relay, both said first relay and latch-up relay having an electromagnetic energizing coil and responding normally open and normally closed contacts, said first relay coil operably connected to said associated appliance power cord through said latch-up relay normally closed contact, and said first relay normally closed contact operably connected between said electrical battery and said warning sound device, said latch-up relay coil operably connected to said battery through said first relay normally closed contact whereby said first relay coil is continually energized by the outside electrical power source and the warning device inhibited, but when the outside electrical power source is removed from the appliance, said warning device is activated by said electrical battery through said first relay normally closed contacts and said latch-up relay coil is also energized and thereby removes said first relay coil from the outside power source in order that the re-application of power to the appliance's electrical power cord does not shut off the warning device.
Claim 2
Dependent Claim
213 words
An electrical appliance theft alarm for installation on an appliance for detection of the removal of the electrical power through the appliance associated electrical power cord from an electrical power source comprising a warning sound device an electrical battery for powering said warning sound device, and a first relay and a latch-up relay, both said first relay and latch-up relay having an electromagnetic energizing coil and responding normally open and normally closed contacts, said first relay coil operably connected to said associated appliance power cord through said latch-up relay normally closed contact, and said first relay normally closed contact operably connected between said electrical battery and said warning sound device, said latch-up relay coil operably connected to said battery through said first relay normally closed contact whereby said first relay coil is continually energized by the outside electrical power source and the warning device inhibited, but when the outside electrical power source is removed from the appliance, said warning device is activated by said electrical battery through said first relay normally closed contacts and said latch-up relay coil is also energized and thereby removes said first relay coil from the outside power source in order that the re-application of power to the appliance's electrical power cord does not shut off the warning device.
Claim 3
Dependent Claim
70 words
The electrical appliance theft alarm as defined in claim 1 further including key contact means operably connected between said first relay and said electrical battery, said key contact means adapted to make and break electrical contact by insertion and turning of a key whereby the electrical connection between said electrical battery and said first relay may be interrupted by keying said key contact means off and thereby inactivating the alarm.
Claim 4
Dependent Claim
46 words
The electrical appliance theft alarm as defined in claim 1 wherein said electrical battery includes electrical battery charger and an electrical battery, said electrical battery charger operably connected to the appliance associated electrical power cord, and said electrical battery operably connected to said electrical battery charger.
Claim 5
Dependent Claim
20 words
The electrical appliance theft alarm as defined in claim 1 wherein said warning sound device comprises an electrically actuated siren.
Claim 6
Dependent Claim
21 words
The electrical appliance theft alarm as defined in claim 1 wherein said warning sound device comprises an electrically actuated audio horn.
Claim 7
Dependent Claim
54 words
The electrical appliance theft alarm as defined in claim 1 wherein said warning sound device comprises electrical oscillator and electrical loudspeaker, said electrical oscillator operably connected to said loudspeaker whereby when electrical power is removed from the appliance, said oscillator will generate an electrical signal which is supplied to the loudspeaker sounding an alarm.
Claim 8
Dependent Claim
70 words
The electrical appliance theft alarm as defined in claim 6 wherein said warning sound device additionally includes isolation relay, said isolation relay operably connected between said electrical oscillator and said electrical loudspeaker, said isolation relay also operably connected to said electrical relay whereby said isolation relay permits connection between said electrical oscillator and said electrical loudspeaker when said oscillator generates an electrical signal to be supplied to said electrical loudspeaker.
References Cited (Backward Citations)
US3192518A
Cited
US3289194A
Cited
US3484775A
Cited
US3553673A
Cited
US3794989A
Cited
US3836901A
Cited
US4028691A
Cited
US4075617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |