US4001522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ribbon type 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 type loudspeaker comprises permanent magnets defining a magnetic system and sound reproducing ribbons extending in the working gaps between the pole pieces of the permanent magnets. The sound reproducing ribbon is made up of individual conductive strips applied onto a dielectric backing parallel with one another, with spaces left therebetween, longitudinally of the sound reproducing ribbon. The disclosed ribbon type loudspeaker enables improvement of the quality of sound reproduction and simultaneously prolongs the service life of the loudspeaker.
Inventors
- 👤 Alexei Fedoseevich Kasatkin
- 👤 Jury Vasilievich Smirnov
- 👤 Ilya Afanasievich Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:42
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
77 words
A ribbon type loudspeaker comprising: a. permanent magnets defining a magnetic system; a working gap between pole pieces of said permanent magnets; b. at least one sound reproducing ribbon extending in the working gap between the pole pieces of said permanent magnets; and a dielectric backing of said sound reproducing ribbon, conductive strips of said sound reproducing ribbon applied onto said dielectric backing parallel with one another, with spaces left therebetween, longitudinally of said sound reproducing ribbon.
Claim 2
Dependent Claim
77 words
A ribbon type loudspeaker comprising: a. permanent magnets defining a magnetic system; a working gap between pole pieces of said permanent magnets; b. at least one sound reproducing ribbon extending in the working gap between the pole pieces of said permanent magnets; and a dielectric backing of said sound reproducing ribbon, conductive strips of said sound reproducing ribbon applied onto said dielectric backing parallel with one another, with spaces left therebetween, longitudinally of said sound reproducing ribbon.
References Cited (Backward Citations)
FR939508A
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 |