US4001523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon loudspeaker
Assignee: Individual
•
Filing: 1976-01-05
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Granted: 1977-01-04
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Expires: 1996-01-05
Abstract
Abstract According to the invention, the ribbon loudspeaker comprises permanent magnets defining a magnetic system and ribbons for sound reproduction received in the working gap between the pole faces of the permanent magnets. The electrically conductive layer of the sound reproducing ribbon has its thickness increasing from the lateral edges thereof, disposed adjacent to the pole faces of the permanent magnets, to the center portion thereof. The disclosed ribbon loudspeaker improves the quality of sound reproduction.
Inventors
- 👤 Alexei Fedoseevich Kasatkin
- 👤 Jury Vasilievich Smirnov
- 👤 Ilya Afanasievich Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:09
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; H04R9/048
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A ribbon type loudspeaker comprising: a. permanent magnets defining a magnetic system, a working gap being defined between pole faces of said permanent magnets; and b. at least one ribbon for sound reproduction having an electrically conductive portion received in said working gap between the pole faces of said permanent magnets, said electrically conductive portion having its thickness increasing from the edges of said sound reproducing ribbon, disposed adjacent to the pole faces of said permanent magnets, toward a maximum at the central portion of said sound reproducing ribbon.
Claim 2
Dependent Claim
89 words
A ribbon type loudspeaker comprising: a. permanent magnets defining a magnetic system, a working gap being defined between pole faces of said permanent magnets; and b. at least one ribbon for sound reproduction having an electrically conductive portion received in said working gap between the pole faces of said permanent magnets, said electrically conductive portion having its thickness increasing from the edges of said sound reproducing ribbon, disposed adjacent to the pole faces of said permanent magnets, toward a maximum at the central portion of said sound reproducing ribbon.
References Cited (Backward Citations)
GB604908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |