US3718779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker diaphragm having marginal air release passages and center high frequency propagator
Assignee: ELECTRONIC RES ASS Inc
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Filing: 1970-10-29
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Granted: 1973-02-27
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Expires: 1990-10-29
Abstract
Abstract SOUND REPRODUCING EQUIPMENT COMPRISING A FRAME HAVING A DIAPHRAGM SUPPORTED AT ITS PERIPHERAL EDGES BY SAID FRAME. THE DIAPHRAGM IS PREFERABLY MOUNTED ON THE FRAME IN A MANNER TO PERMIT MOVEMENT OF THE DIAPHRAGM AS A COMPLETE ENTITY AT LOW FREQUENCIES. AT THE SAME TIME THE DIAPHRGM IS PROVIDED WITH A HIGH FREQUENCY PROPAGATOR WHICH COOPERATES WITH THE VOICE COIL AND DIAPHRAGM TO INCREASE THE RANGE OF THE VIBRATIONS PRODUCED BY THE EQUIPMENT WITHOUT INTRODUCING FEED-BACK OR DISTORTIONAL CHARACTERISTICS DURING OPERATION. AS A RESULT THE COMBINATION SERVES TO EXTEND THE FREQUENCY RESPONSE OF THE EQUIPMENT AND INCREASE THE FIDELITY OF THE SOUND REPRODUCTION.
Inventors
- 👤 H Schoengold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:25
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R1/00; H04R1/02; H04R1/021; H04R7/00; H04R7/02; H04R7/04; H04R7/16; H04R9/02; H04R9/04; H04R9/045
Claims Analysis
Total Claims: 0
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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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |