Patent US4437428A successfully refreshed from Google Patents.
US4437428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for generating sound waves at relatively high frequencies
Assignee: Individual
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Filing: 1982-03-19
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Granted: 1984-03-20
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Expires: 2002-03-19
Abstract
Abstract A device for generating warning signals consisting of sound waves at frequencies between 14 and 26 kHz, preferably intended to be mounted on a motor vehicle so that the device will be actuated by the wind. The device operates similar to a flue pipe and generates a subatmospheric pressure behind the sharp edge of the flue pipe. The subatmospheric pressure is created by a passage continuing to a resonant chamber, open at its rear end, the passage being larger in cross-section than the resonant chamber. The passage is formed in a body which has substantially the shape of a frustum of a cone and is formed with longitudinal through slots which extend from the passage. With this design, a subatmospheric pressure is generated which excites the pipe to vibrate even in a relatively slow wind.
Inventors
- 👤 Volkwin Hoffelner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:46
CPC Classifications
A; A01; A01M; A01M29/00; A01M29/16; A01M29/18; B; B60; B60Q; B60Q5/00; G; G10; G10K; G10K5/00; G10K5/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
A device for generating sound waves for use with a motor vehicle, said device comprising: a frustoconical body; means for mounting said body on said motor vehicle; and a flue pipe within said body adapted for channelling an air stream to generate sound waves, said flue pipe comprising: an inlet funnel for initially receiving said air stream; a blowing passage for receiving air from said inlet funnel; a resonant chamber for receiving air from said blowing passage; a sharp edge in said resonant chamber for interrupting the flow of said air stream; a horn for receiving air from said resonant chamber for producing sound waves; and a passage for receiving air from said resonant chamber, said passage being larger in cross-section than said resonant chamber.
Claim 2
Independent Claim
125 words
A device for generating sound waves for use with a motor vehicle, said device comprising: a frustoconical body; means for mounting said body on said motor vehicle; and a flue pipe within said body adapted for channelling an air stream to generate sound waves, said flue pipe comprising: an inlet funnel for initially receiving said air stream; a blowing passage for receiving air from said inlet funnel; a resonant chamber for receiving air from said blowing passage; a sharp edge in said resonant chamber for interrupting the flow of said air stream; a horn for receiving air from said resonant chamber for producing sound waves; and a passage for receiving air from said resonant chamber, said passage being larger in cross-section than said resonant chamber.
Claim 3
Dependent Claim
17 words
A device as claimed in claim 1, wherein said passage contains longitudinal slots extending through said body.
Claim 4
Dependent Claim
21 words
A device as claimed in claim 1, wherein said generated sound waves are in the frequency of 14 to 26 kHz.
Claim 5
Dependent Claim
20 words
A device as claimed in claim 1, wherein said horn extends in a generally perpendicular direction from said resonant chamber.
Claim 6
Dependent Claim
33 words
A device as claimed in claim 4, wherein said horn extends through said body and an apron extends from said body adapted for blocking oncoming air from entering a mouth of said horn.
Claim 7
Dependent Claim
32 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with a beveled surface adapted for deflecting the sound waves emitted from said mouth of said opening.
Claim 8
Dependent Claim
42 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with an arm adapted for carrying said body, said arm containing a rectangular window adapted for deflecting the sound waves emitted from said mouth of said horn.
Claim 9
Dependent Claim
47 words
A device as claimed in claim 5, wherein said means for mounting comprises a bracket with a beveled surface and an arm with a rectangular window, said beveled surface and said rectangular window are adapted for deflecting the sound waves emitted from said mouth of said horn.
Claim 10
Dependent Claim
17 words
A device as claimed in claim 1, wherein said body forms a unit in a torpedo shape.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |