Patent US4090040A successfully refreshed from Google Patents.
US4090040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing aid with acoustical frequency response modification
Assignee: Individual
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Filing: 1977-05-27
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Granted: 1978-05-16
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Expires: 1997-05-27
Abstract
Abstract A hearing aid for individuals with a loss of sensitivity to the higher frequencies acoustically attenuates the lower frequencies by providing a sound reproducer coupled to a sound delivering conduit provided with an aperture of prescribed size coupled to a cavity which surrounds the sound reproducer.
Inventors
- 👤 Ole Berland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:48
CPC Classifications
H; H04; H04R; H04R25/00; H04R25/48; H04R1/00; H04R1/20; H04R1/22; H04R1/225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
52 words
A hearing aid for persons who are hard of hearing, comprising a sound receiver, amplifier, and sound reproducer, to which conduit for delivering sound is connected, characterized in that one or more openings disposed within the housing lead from the interior of the conduit to a cavity which surrounds the sound reproducer.
Claim 2
Dependent Claim
52 words
A hearing aid for persons who are hard of hearing, comprising a sound receiver, amplifier, and sound reproducer, to which conduit for delivering sound is connected, characterized in that one or more openings disposed within the housing lead from the interior of the conduit to a cavity which surrounds the sound reproducer.
Claim 3
Dependent Claim
25 words
A hearing aid according to claim 1, characterized in that at least one opening consists of a bore through the wall of a flexible tubing.
Claim 4
Dependent Claim
29 words
A hearing aid according to claim 1, characterized in that at least one opening is formed in a bushing, which is inserted in the wall of a flexible tubing.
Claim 5
Dependent Claim
32 words
A hearing aid according to claim 1, characterized in that the opening or openings is or are formed in a tube which is connected between the sound reproducer and a flexible tubing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |