Patent US3868684A successfully refreshed from Google Patents.
US3868684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Emergency vehicle siren switching apparatus
Assignee: Individual
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Filing: 1972-01-07
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Granted: 1975-02-25
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Expires: 1992-01-07
Abstract
Abstract An emergency vehicle audible warning system having a control circuit with a means for switching said control circuit to activate a tone generator for creating a yelp tone or a wail tone. A siren amplifier interfaces a siren speaker and the yelp and wail tone generators. A series of switches are also provided in operative connection with the horn ring of an automobile or a foot switch, so that the yelp or wail tone can be effectuated thereby upon the demand of the driver of the emergency vehicle.
Inventors
- 👤 Jr Ewing D Nunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:40
CPC Classifications
B; B60; B60Q; B60Q5/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
The combination of a vehicle and an audible warning system which comprises: An electronic circuit having a given electrical capacitance for generating an electrical signal to provide a siren tone having a relatively moderate frequency of rise and fall between its high and low tones in the form of a wail tone; a siren speaker; electrical circuit means to decrease the capacitance of said electrical circuit for electrically altering said electronic circuit to provide a second signal effecting a second siren tone having a greater frequency of rise and fall between its high and low tones in the form of a yelp tone; switch means to selectively connect said electrical circuit means for causing said yelp tone to be generated in lieu of said wail tone; and, an electromotive force of a suitable potential to power the electronic circuits for providing said tones.
Claim 2
Dependent Claim
143 words
The combination of a vehicle and an audible warning system which comprises: An electronic circuit having a given electrical capacitance for generating an electrical signal to provide a siren tone having a relatively moderate frequency of rise and fall between its high and low tones in the form of a wail tone; a siren speaker; electrical circuit means to decrease the capacitance of said electrical circuit for electrically altering said electronic circuit to provide a second signal effecting a second siren tone having a greater frequency of rise and fall between its high and low tones in the form of a yelp tone; switch means to selectively connect said electrical circuit means for causing said yelp tone to be generated in lieu of said wail tone; and, an electromotive force of a suitable potential to power the electronic circuits for providing said tones.
Claim 3
Dependent Claim
22 words
The combination as claimed in claim 1 wherein said switch means comprises the switch connected to the horn ring of the vehicle.
Claim 4
Dependent Claim
113 words
An improved audible warning system in combination with an emergency vehicle comprising: a tone generating circuit for generating a signal to provide a first siren sound from a low to high pitch at a prescribed frequency between the low and high pitch; a siren speaker; a suitable power supply for operating the system; capacitance means within said tone generating circuit to effectuate the prescribed frequency between the high and low pitch; and, switch means to eliminate at least a portion of said capacitance means to cause said tone generating circuit to create a tone signal between the high and low pitch at a greater frequency than said prescribed frequency of the first tone.
Claim 5
Dependent Claim
113 words
An improved audible warning system in combination with an emergency vehicle comprising: a tone generating circuit for generating a signal to provide a first siren sound from a low to high pitch at a prescribed frequency between the low and high pitch; a siren speaker; a suitable power supply for operating the system; capacitance means within said tone generating circuit to effectuate the prescribed frequency between the high and low pitch; and, switch means to eliminate at least a portion of said capacitance means to cause said tone generating circuit to create a tone signal between the high and low pitch at a greater frequency than said prescribed frequency of the first tone.
Claim 6
Dependent Claim
16 words
The combination as claimed in claim 3 wherein said switch means in part comprises: a relay.
Claim 7
Dependent Claim
23 words
The combination as claimed in claim 4 wherein: said relay is connected to and is actuated by a horn switch of the vehicle.
Claim 8
Dependent Claim
16 words
The combination as claimed in claim 4 wherein: said relay is activated by a foot switch.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |