US3342953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducer
Assignee: AKG Acoustics GmbH
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Filing: 1963-10-11
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Granted: 1967-09-19
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Expires: 1983-10-11
Abstract
No abstract record available.
Inventors
- 👤 Pless Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:08
CPC Classifications
H; H04; H04R; H04R9/00; H04R1/00; H04R1/06; H04R31/00; H04R31/006; H04R9/02; H04R9/025; H04R2201/00; H04R2201/34; H04R2209/00; H04R2209/024; H04R2400/00; H04R2400/11; H04R2499/00; H04R2499/10; H04R2499/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN AN ELECTRO-ACOUSTIC TRANSDUCER, A MAGNETIC SYSTEM INCLUDING AN AXIALLY ELONGATED ANNULAR PERMANENT MAGNET, A PAIR OF ANNULAR POLE PIECES HAVING SUBSTANTIALLY FLAT PORTIONS ENGAGED WITH THE RESPECTIVE AXIALLY OPPOSITE ENDS OF SAID ANNULAR PERMANENT MAGNET AND DEFINING THEREWITH AN AXIAL PASSAGE, AND A SUBSTANTIALLY CYLINDRICAL MAGNETIC YOKE EMBRACING SAID PERMANENT MAGNET AND SAID POLE PIECES AND HAVING ONE END ENGAGING THE RADIALLY OUTER PERIPHERY OF ONE POLE PIECE AND HAVING A RADIALLY INWARDLY EXTENDING PORTION AT ITS OPPOSITE END RADIALLY SPACED FROM THE RADIALLY OUTER PERIPHERY OF THE OTHER POLE PIECE TO DEFINE AN ANNULAR AIR GAP COAXIAL WITH SAID AXIAL PASSAGE; A MOVING COIL POSITIONED IN AND DISPLACEABLE AXIALLY OF THE AIR GAP; AND A BODY OF MOLDABLE MATERIAL AT LEAST PARTIALLY FILLING SAID AXIAL PASSAGE AND EXTENDING
Claim 2
Dependent Claim
130 words
IN AN ELECTRO-ACOUSTIC TRANSDUCER, A MAGNETIC SYSTEM INCLUDING AN AXIALLY ELONGATED ANNULAR PERMANENT MAGNET, A PAIR OF ANNULAR POLE PIECES HAVING SUBSTANTIALLY FLAT PORTIONS ENGAGED WITH THE RESPECTIVE AXIALLY OPPOSITE ENDS OF SAID ANNULAR PERMANENT MAGNET AND DEFINING THEREWITH AN AXIAL PASSAGE, AND A SUBSTANTIALLY CYLINDRICAL MAGNETIC YOKE EMBRACING SAID PERMANENT MAGNET AND SAID POLE PIECES AND HAVING ONE END ENGAGING THE RADIALLY OUTER PERIPHERY OF ONE POLE PIECE AND HAVING A RADIALLY INWARDLY EXTENDING PORTION AT ITS OPPOSITE END RADIALLY SPACED FROM THE RADIALLY OUTER PERIPHERY OF THE OTHER POLE PIECE TO DEFINE AN ANNULAR AIR GAP COAXIAL WITH SAID AXIAL PASSAGE; A MOVING COIL POSITIONED IN AND DISPLACEABLE AXIALLY OF THE AIR GAP; AND A BODY OF MOLDABLE MATERIAL AT LEAST PARTIALLY FILLING SAID AXIAL PASSAGE AND EXTENDING
References Cited (Backward Citations)
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |