Patent DE870182C successfully refreshed from Google Patents.
Patent US3876035A successfully refreshed from Google Patents.
US3876035A
Expired / Lapsed
US
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Acoustical testing apparatus
Assignee: Eckel Ind Inc
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Filing: 1974-05-13
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Granted: 1975-04-08
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Expires: 1994-05-13
Abstract
Abstract Testing apparatus for hearing aids and the like has an outer cabinet enclosed by a top, bottom and sides within which is a horn-shaped anechoic inner chamber that encloses the component to be tested, which chamber is formed of sound absorbing panels, having a smooth interior surface, and which increase in thickness from the top towards the bottom. Said chamber has a bottom and a well is formed below the bottom that communicates with the chamber and is of greater width at the point of communication. A cover for said chamber is lined with wedge-shaped sound absorbing panels that extend from the top downwardly.
Inventors
- 👤 Alan Eckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:44
CPC Classifications
H; H04; H04R; H04R29/00; H04R29/004; G; G01; G01H; G01H3/00; H04R25/00; H04R25/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
67 words
Acoustical testing apparatus comprising an outer housing, a sound absorbing chamber within said outer housing having a bottom and a horn-shaped, anechoic chamber extending upwardly from said bottom and formed of panels in side-by-side relationship and flaring outwardly towards the top, said panels having a smooth, interior surface and varying in thickness, the lowest portions thereof being thicker than the portions forming the top of said chamber.
Claim 2
Dependent Claim
67 words
Acoustical testing apparatus comprising an outer housing, a sound absorbing chamber within said outer housing having a bottom and a horn-shaped, anechoic chamber extending upwardly from said bottom and formed of panels in side-by-side relationship and flaring outwardly towards the top, said panels having a smooth, interior surface and varying in thickness, the lowest portions thereof being thicker than the portions forming the top of said chamber.
Claim 3
Dependent Claim
42 words
Acoustical testing apparatus as set forth in claim 1, portions of said panels extending from said lowest portions straight upwardly and portions extending upwardly from the latter flaring outwardly and terminating at a point adjacent the top and side of said housing.
Claim 4
Dependent Claim
73 words
Acoustical testing apparatus as set forth in claim 1, said chamber bottom having an opening spaced inwardly from the outer side extremity thereof, and a well member extending lower than said opening having an interior space extending downwardly from said bottom and communicating with said chamber opening, said well member having side means extending downwardly from said chamber bottom and a bottom connected to and extending from and between said latter side means.
Claim 5
Dependent Claim
22 words
Acoustical testing apparatus as set forth in claim 3, said well member and its interior space extending laterally beyond said chamber opening.
Claim 6
Dependent Claim
27 words
Acoustical testing apparatus as set forth in claim 3, and sound absorbing material extending inwardly of and in contact with said well member side means and bottom.
Claim 7
Dependent Claim
26 words
Acoustical testing apparatus as set forth in claim 3, said housing having a bottom plate below said well bottom and communicating with said well interior space.
Claim 8
Dependent Claim
33 words
Acoustical testing apparatus as set forth in claim 1, and a cover for said housing having wedge-shaped, insulating members extending downwardly from said cover and being spaced from the lower extremity thereof upwardly.
References Cited (Backward Citations)
US3295133A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |