Patent US3324253A successfully refreshed from Google Patents.
US3324253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Small-sized electroacoustic transducers
Assignee: Panasonic Holdings Corp
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Filing: 1963-10-14
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Granted: 1967-06-06
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Uemura Masahiko
- 👤 Kudo Shigeru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:40
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
AN ELECTROACOUSTIC TRANSDUCER OF SMALL SIZE COMPRISING, A CYLINDRICAL FRAME, A POLE PIECE DISPOSED CENTRALLY IN SAID CYLINDRICAL FRAME, A COIL DISPOSED CONCENTRICALLY ABOUT SAID POLE PIECE, A CYLINDRICAL PERMANENT MAGNET DISPOSED CONCENTRICALLY ABOUT SAID COIL, A DIAPHRAGM MOUNTED ON THE ASSEMBLY OF SAID POLE PIECE, COIL AND PERMANENT MAGNET, A YOKE DISPOSED BELOW THE ASSEMBLY OF SAID POLE PIECE, COIL AND PERMANENT MAGNET, A PLATE OF MAGNETIC MATERIAL DISPOSED BETWEEN SAID DIAPHRAGM AND SAID CYLINDRICAL PERMANENT MAGNET, A FIRST SPACE DEFINED BETWEEN SAID PLATE OF MAGNETIC MATERIAL AND SAID DIAPHRAGM, A SECOND SPACE DEFINED BY SAID PLATE OF MAGNETIC MATERIAL, CYLINDRICAL FRAME AND YOKE, A SMALL BORE IN SAID PLATE OF MAGNETIC MATERIAL PROVIDING COMMUNICATION BETWEEN SAID FIRST SPACE AND SECOND SPACE, A SPACE BELOW SAID YOKE, AND A SMALL BORE IN SAID YOKE PROVIDING COMMUNICATION BETWEEN SAID SECOND SPACE AND SAID SPACE BELOW SAID YOKE.
Claim 2
Dependent Claim
147 words
AN ELECTROACOUSTIC TRANSDUCER OF SMALL SIZE COMPRISING, A CYLINDRICAL FRAME, A POLE PIECE DISPOSED CENTRALLY IN SAID CYLINDRICAL FRAME, A COIL DISPOSED CONCENTRICALLY ABOUT SAID POLE PIECE, A CYLINDRICAL PERMANENT MAGNET DISPOSED CONCENTRICALLY ABOUT SAID COIL, A DIAPHRAGM MOUNTED ON THE ASSEMBLY OF SAID POLE PIECE, COIL AND PERMANENT MAGNET, A YOKE DISPOSED BELOW THE ASSEMBLY OF SAID POLE PIECE, COIL AND PERMANENT MAGNET, A PLATE OF MAGNETIC MATERIAL DISPOSED BETWEEN SAID DIAPHRAGM AND SAID CYLINDRICAL PERMANENT MAGNET, A FIRST SPACE DEFINED BETWEEN SAID PLATE OF MAGNETIC MATERIAL AND SAID DIAPHRAGM, A SECOND SPACE DEFINED BY SAID PLATE OF MAGNETIC MATERIAL, CYLINDRICAL FRAME AND YOKE, A SMALL BORE IN SAID PLATE OF MAGNETIC MATERIAL PROVIDING COMMUNICATION BETWEEN SAID FIRST SPACE AND SECOND SPACE, A SPACE BELOW SAID YOKE, AND A SMALL BORE IN SAID YOKE PROVIDING COMMUNICATION BETWEEN SAID SECOND SPACE AND SAID SPACE BELOW SAID YOKE.
References Cited (Backward Citations)
US2794862A
Cited
US3092693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-06-05 | 1970-12-05 | 1971-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-06-05 | 1974-12-05 | 1975-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-06-05 | 1978-12-05 | 1979-06-06 | $7700.00 | Window Closed / Lapsed |