Patent US3158697A successfully refreshed from Google Patents.
US3158697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-system dynamic earphone
Assignee: AKG Acoustics GmbH
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Filing: 1962-04-04
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Granted: 1964-11-24
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Expires: 1982-04-04
Abstract
No abstract record available.
Inventors
- 👤 Gorike Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:12
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/10; H04R1/00; H04R1/20; H04R1/22; H04R1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A DYNAMIC EARPHONE WHICH COMPRISES AT LEAST ONE EARPIECE HAVING A PORTION ADAPTED TO CONTACT A HUMAN EAR, SAID PORTION DEFINING AN ANNULAR CAVITY, SAID EARPIECE INCORPORATION INNER AND OUTER ACTUATING SYSTEMS WHICH ARE CONCENTRICALLY ARRANGED RELATIVE TO EACH OTHER AND COMPRISE EACH A DIAPHRAGM AND A MOVABLE COIL ENERGIZABLE TO ACTUATE SAID DIAPHRAGM, SAID INNER SYSTEM BEING DESIGNED FOR A PREFERENTIAL REPRODUCTION OF RELATIVELY HIGH TONES AND SAID OUTER SYSTEM BEING DESIGNED FOR A PREFERENTIAL REPRODUCTION OF RELATIVELY LOW TONES, SAID DIAPHRAGM OF SAID OUTER SYSTEM EXTENDING INTO SAID CAVITY.
Claim 2
Dependent Claim
91 words
A DYNAMIC EARPHONE WHICH COMPRISES AT LEAST ONE EARPIECE HAVING A PORTION ADAPTED TO CONTACT A HUMAN EAR, SAID PORTION DEFINING AN ANNULAR CAVITY, SAID EARPIECE INCORPORATION INNER AND OUTER ACTUATING SYSTEMS WHICH ARE CONCENTRICALLY ARRANGED RELATIVE TO EACH OTHER AND COMPRISE EACH A DIAPHRAGM AND A MOVABLE COIL ENERGIZABLE TO ACTUATE SAID DIAPHRAGM, SAID INNER SYSTEM BEING DESIGNED FOR A PREFERENTIAL REPRODUCTION OF RELATIVELY HIGH TONES AND SAID OUTER SYSTEM BEING DESIGNED FOR A PREFERENTIAL REPRODUCTION OF RELATIVELY LOW TONES, SAID DIAPHRAGM OF SAID OUTER SYSTEM EXTENDING INTO SAID CAVITY.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |