US3742480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm device for detecting removal of or tampering with appliances or other articles
Assignee: Individual
•
Filing: 1971-11-04
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Granted: 1973-06-26
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Expires: 1991-11-04
Abstract
Abstract An electric alarm device for detecting removal or displacement of objects comprises a lamp of the thermostatic intermittent flashing type connected in series with a semi-conductor switch which is biased to its non-conducting position by a circuit including a wire conductor which when detached or broken removes the bias on the switch and causes the switch to conduct. A second switch arranged to be connected in series with an alarm actuating coil is biased to its off or non-conducting condition when there is no current flowing through the circuit of the first switch and is turned on or triggered when the lamp is energized and thereby produces intermittent energization of the alarm actuating coil and effects intermittent operation of the alarm. The device including the lamp is encapsulated in a rigid synthetic plastic block by a method which affords protection of the lamp from breakage due to pressure during curing of the plastic.
Inventors
- 👤 A Hoecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:46
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/02; G08B13/14; G08B13/1445; G08B13/1454; B; B60; B60R; B60R25/00; B60R25/10; B60R25/1001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
As an article of Manufacture, an alarm actuating device comprising, an electric lamp of the thermostatic intermittent flashing type, means including a first switch for connecting said lamp across a power source, means for biasing said first switch to its open condition, a second switch, means for connecting said second switch across said power source, means for biasing said second switch to its open condition, and means for utilizing current flowing through said lamp and first switch for triggering said second switch to its closed condition, whereby when said biasing means for said first switch is disabled to render said first switch conducting said second switch will conduct and the current passing therethrough may be utilized to actuate an alarm, the current through said second switch flowing intermittently with the intermittent operation of said lamp and the resulting intermittent biasing of said second switch.
Claim 2
Dependent Claim
144 words
As an article of Manufacture, an alarm actuating device comprising, an electric lamp of the thermostatic intermittent flashing type, means including a first switch for connecting said lamp across a power source, means for biasing said first switch to its open condition, a second switch, means for connecting said second switch across said power source, means for biasing said second switch to its open condition, and means for utilizing current flowing through said lamp and first switch for triggering said second switch to its closed condition, whereby when said biasing means for said first switch is disabled to render said first switch conducting said second switch will conduct and the current passing therethrough may be utilized to actuate an alarm, the current through said second switch flowing intermittently with the intermittent operation of said lamp and the resulting intermittent biasing of said second switch.
Claim 3
Dependent Claim
38 words
An alarm actuating device as set forth in claim 1 wherein said means for biasing said first switch includes an extended conductor constituting a sensor for engagement with an object, the displacement of which is to be detected.
Claim 4
Dependent Claim
43 words
An alarm actuating device as set forth in claim 1 wherein said first and second switches are transistors, and including a diode connected across said second switch for by-passing current flowing in a reverse direction through said connecting means from said second switch.
Claim 5
Dependent Claim
32 words
An alarm actuating device as set forth in claim 1, said lamp having a covering of compressible synthetic plastic material, and said device being embedded in a block of rigid plastic material.
Claim 6
Dependent Claim
20 words
An alarm actuating device as set forth in claim 4, said covering being a coating of a compressible silicone rubber.
Claim 7
Dependent Claim
129 words
An alarm system for detecting and indicating a displacement of an object comprising, an electric lamp of the thermostatic intermittent flashing type, means including a first semi-conductor switch for connecting said lamp across a power source, means for biasing said first switch to its nonconducting condition, a second semi-conductor switch, means including a relay coil for connecting said second switch across said power source, means for utilizing current flowing through said lamp and said first switch for triggering said second switch to its conducting condition whereby disabling of said biasing means for said first switch renders said first switch conducting and energizes said lamp to effect intermittent energization of said lamp and of said relay coil, and means effective upon energization of said relay coil for actuating said alarm.
Claim 8
Dependent Claim
129 words
An alarm system for detecting and indicating a displacement of an object comprising, an electric lamp of the thermostatic intermittent flashing type, means including a first semi-conductor switch for connecting said lamp across a power source, means for biasing said first switch to its nonconducting condition, a second semi-conductor switch, means including a relay coil for connecting said second switch across said power source, means for utilizing current flowing through said lamp and said first switch for triggering said second switch to its conducting condition whereby disabling of said biasing means for said first switch renders said first switch conducting and energizes said lamp to effect intermittent energization of said lamp and of said relay coil, and means effective upon energization of said relay coil for actuating 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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |