US3074504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loud-speaker
Assignee: LIBERTY Manufacturing CORP
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Filing: 1961-05-25
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Granted: 1963-01-22
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Walter C Trautman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:12
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/26; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A LOUDSPEAKER COMPRISING. A. A SPEAKER DIAPHRAGM, B. A MOUNT FOR SAID DIAPHRAGM, C. MEANS FOR RESILIENTLY SECURING SAID DIAPHRAGM TO SAID MOUNT, D. MEANS FOR VIBRATING THE SPEAKER DIAPHRAGM, E. A FLEXIBLE POROUS DAMPER DIAPHRAGM MOUNTED ON SAID SPEAKER DIAPHRAGM, F. A WEIGHT MOUNTED ON SAID DAMPER DIAPHRAGM, AND G. A CLOSED AIR CAVITY FORMED BETWEEN THE DIAPHRAGMS BY SPACING THE MAJOR PORTIONS AT LEAST OF THE DIAPHRAGMS AWAY FROM EACH OTHER, H. SAID POROUS DAMPER DIAPHRAGM PROVIDING RESISTANCE TO THE MOVEMENT OF AIR IN AND OUT OF SAID CAVITY.
Claim 2
Dependent Claim
91 words
A LOUDSPEAKER COMPRISING. A. A SPEAKER DIAPHRAGM, B. A MOUNT FOR SAID DIAPHRAGM, C. MEANS FOR RESILIENTLY SECURING SAID DIAPHRAGM TO SAID MOUNT, D. MEANS FOR VIBRATING THE SPEAKER DIAPHRAGM, E. A FLEXIBLE POROUS DAMPER DIAPHRAGM MOUNTED ON SAID SPEAKER DIAPHRAGM, F. A WEIGHT MOUNTED ON SAID DAMPER DIAPHRAGM, AND G. A CLOSED AIR CAVITY FORMED BETWEEN THE DIAPHRAGMS BY SPACING THE MAJOR PORTIONS AT LEAST OF THE DIAPHRAGMS AWAY FROM EACH OTHER, H. SAID POROUS DAMPER DIAPHRAGM PROVIDING RESISTANCE TO THE MOVEMENT OF AIR IN AND OUT OF 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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |