Patent US3079471A successfully refreshed from Google Patents.
US3079471A
Expired / Lapsed
US
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Loudspeaker
Assignee: Ampex Corp
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Filing: 1961-03-01
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Granted: 1963-02-26
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Maurice W Widener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:12
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/127; H04R9/00; H04R9/02; H04R9/04; H04R9/045; H04R9/06; H04R9/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A WIDE FREQUENCY RANGE LOUDSPEAKER COMPRISING: A HOUSING DEFINING AN ACOUSTICAL CHAMBER CLOSED AT ONE END; A DIAPHRAGM MOUNTED CLOSING THE OTHER END OF SAID CHAMBER AND ARRANGED FOR AXIAL MOVEMENT RELATIVE TO SAID HOUSING TO CAUSE AIR PRESSURE VARIATIONS WITHIN AND WITHOUT SAID CHAMBER, SAID DIAPHRAGM HAVING A FLEXIBLE PERIPHERAL PORTION SECURED TO SAID HOUSING AND A RIGID CENTRAL PORTION IN THE SHAPE OF AN OBLATE DOME ORIENTED WITH THE CONCAVE SIDE FACING SAID CHAMBER; AND ELECTROMAGNETIC MEANS ENGAGING THE PERIPHERY OF SAID DOME PORTION FOR EFFECTING AXIAL MOTION OF SAID DOME PORTION IN RESPONSE TO VARIATIONS OF A CONTROL SIGNAL SO AS TO PRODUCE CORRESPONDING SOUND WAVES.
Claim 2
Dependent Claim
109 words
A WIDE FREQUENCY RANGE LOUDSPEAKER COMPRISING: A HOUSING DEFINING AN ACOUSTICAL CHAMBER CLOSED AT ONE END; A DIAPHRAGM MOUNTED CLOSING THE OTHER END OF SAID CHAMBER AND ARRANGED FOR AXIAL MOVEMENT RELATIVE TO SAID HOUSING TO CAUSE AIR PRESSURE VARIATIONS WITHIN AND WITHOUT SAID CHAMBER, SAID DIAPHRAGM HAVING A FLEXIBLE PERIPHERAL PORTION SECURED TO SAID HOUSING AND A RIGID CENTRAL PORTION IN THE SHAPE OF AN OBLATE DOME ORIENTED WITH THE CONCAVE SIDE FACING SAID CHAMBER; AND ELECTROMAGNETIC MEANS ENGAGING THE PERIPHERY OF SAID DOME PORTION FOR EFFECTING AXIAL MOTION OF SAID DOME PORTION IN RESPONSE TO VARIATIONS OF A CONTROL SIGNAL SO AS TO PRODUCE CORRESPONDING SOUND WAVES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-25 | 1966-08-27 | 1967-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-25 | 1970-08-27 | 1971-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-25 | 1974-08-27 | 1975-02-26 | $7700.00 | Window Closed / Lapsed |