Patent US2952048A successfully refreshed from Google Patents.
Patent US4274084A successfully refreshed from Google Patents.
US4274084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio-visual signal circuits
Assignee: Cooper Wheelock Inc
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Filing: 1979-10-26
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Granted: 1981-06-16
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Expires: 1999-10-26
Abstract
Abstract An audio-visual alarm includes a flashtube and a voltage signal generator for producing and storing voltages sufficient to operate the flashtube. In series with the flashtube and the voltage generator is the coil of an audio alarm, whereby operation of the flashtube also operates the audio alarm. The audio alarm is selected so that its coil will not interfer with the operation of the flashtube.
Inventors
- 👤 Rein Haus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:53
CPC Classifications
G; G08; G08B; G08B7/00; G08B7/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
A circuit for producing an audio-visual alarm comprising: a flashtube; voltage signal generator means for generating and storing a first voltage across said flashtube and a second voltage on the trigger terminal of said flashtube, said first and second voltages increasing in amplitude to a point at which said flashtube operates, discharging the stored voltage and delivering current from said generator means through said flashtube; and audio signal generator means including a coil located in series with said flashtube and said voltage signal generator means, for producing an audible sound in response to the flow of current from said voltage signal generator means, upon discharge of said stored voltage, the inductance of said coil being such that the current flow through it and the operation of the flashtube are not adversely affected.
Claim 2
Dependent Claim
132 words
A circuit for producing an audio-visual alarm comprising: a flashtube; voltage signal generator means for generating and storing a first voltage across said flashtube and a second voltage on the trigger terminal of said flashtube, said first and second voltages increasing in amplitude to a point at which said flashtube operates, discharging the stored voltage and delivering current from said generator means through said flashtube; and audio signal generator means including a coil located in series with said flashtube and said voltage signal generator means, for producing an audible sound in response to the flow of current from said voltage signal generator means, upon discharge of said stored voltage, the inductance of said coil being such that the current flow through it and the operation of the flashtube are not adversely affected.
Claim 3
Dependent Claim
46 words
A circuit as claimed in claim 1 wherein the voltage signal generator means comprises an a.c. voltage source, a voltage doubler for increasing the amplitude of the voltage and converting it into a high d.c. voltage, and a storage capacitor for storing the high d.c. voltage.
Claim 4
Dependent Claim
49 words
A circuit as claimed in claim 1 wherein the voltage signal generator means comprises a low voltage d.c. source, a d.c. to d.c. converter for increasing the amplitude of the voltage and converting it into a high d.c. voltage; and a storage capacitor for storing the high d.c. voltage.
Claim 5
Dependent Claim
30 words
A circuit as claimed in claims 1, 2, or 3 wherein the audio signal generator comprises a single stroke bell having an armature winding, said coil comprising said armature winding.
Claim 6
Dependent Claim
30 words
A circuit as claimed in claims 1, 2 or 3 wherein the audio signal generator comprises a single stroke chime having an armature winding, said coil comprising said armature winding.
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) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |