US3118972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic apparatus
Assignee: RCA Corp
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Filing: 1961-12-29
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Granted: 1964-01-21
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Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 Walczak Sylvester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:38
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03F3/00; H03F3/181; H03F3/183; H03F3/26; H04; H04R; H04R3/00; H04R3/002; H04R9/00; H04R9/02; H04R9/025; H04R2209/00; H04R2209/022
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A LOUDSPEAKER SYSTEM COMPRISING A LOUDSPEAKER HAVING A MAGNETIC FIELD STRUCTURE INCLUDING A YOKE OF MAGNETIC MATERIAL, A PICKUP DEVICE INCLUDING A PICKUP COIL MOUNTED ON SAID YOKE AND RESPONSIVE TO FRINGE MAGNETIC FLUX EMANATING FROM SAID YOKE, AN ELECTRICAL SYSTEM RESPONSIVE TO ELECTRICAL AUDIO SIGNALS FOR DRIVING SAID LOUDSPEAKER TO REPRODUCE SOUND CORRESPONDING TO SAID SIGNALS, AND MEANS FOR CONNECTING SAID PICKUP COIL AND SAID ELECTRICAL DRIVING SYSTEM IN FEEDBACK RELATIONSHIP WHEREBY TO COMPENSATE FOR DISTORTION IN SAID LOUDSPEAKER.
References Cited (Backward Citations)
US1734944A
Cited
US1901331A
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US2860183A
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US2964597A
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US3047661A
Cited
US3061675A
Cited
US3057961A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |