US3060282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic transducer
Assignee: BALDWIN PIANO Co
•
Filing: 1957-07-26
•
Granted: 1962-10-23
•
Expires: 1977-07-26
Abstract
No abstract record available.
Inventors
- 👤 Robert K Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:45
CPC Classifications
H; H04; H04R; H04R13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
AN ELECTROMAGNETIC ACOUSTICAL TRANSDUCER COMPRISING A HOLLOW CYLINDRICAL HOUSING, A CIRCULAR DIAPHRAGM OF FERROMAGNETIC MATERIAL DISPOSED WITHIN THE HOUSING AND PROVIDED WITH A COATING OF POLYESTER RESIN ON THE SURFACES THEREOF, SAID DIAPHRAGM HAVING A DIAMETER APPROXIMATELY EQUAL TO THE INNER DIAMETER OF THE HOUSING, A CYLINDRICAL SLEEVE OF FERROMAGNETIC MATERIAL DISPOSED WITHIN THE HOUSING ON EACH SIDE OF THE DIAPHRAGM AND ABUTTING THE DIAPHRAGM, AN END PLATE OF FERROMAGNETIC MATERIAL HAVING A PLURALITY OF APERTURES DISPOSED ABUTTING THE SIDE OF EACH OF THE SLEEVES OPPOSITE THE DIAPHRAGM, A MAGNET MOUNTED ON EACH OF THE END PLATES AND EXTENDING TOWARD THE DIPHRAGM, AND A COIL DISPOSED ABOUT EACH OF THE MAGNETS.
Claim 2
Dependent Claim
111 words
AN ELECTROMAGNETIC ACOUSTICAL TRANSDUCER COMPRISING A HOLLOW CYLINDRICAL HOUSING, A CIRCULAR DIAPHRAGM OF FERROMAGNETIC MATERIAL DISPOSED WITHIN THE HOUSING AND PROVIDED WITH A COATING OF POLYESTER RESIN ON THE SURFACES THEREOF, SAID DIAPHRAGM HAVING A DIAMETER APPROXIMATELY EQUAL TO THE INNER DIAMETER OF THE HOUSING, A CYLINDRICAL SLEEVE OF FERROMAGNETIC MATERIAL DISPOSED WITHIN THE HOUSING ON EACH SIDE OF THE DIAPHRAGM AND ABUTTING THE DIAPHRAGM, AN END PLATE OF FERROMAGNETIC MATERIAL HAVING A PLURALITY OF APERTURES DISPOSED ABUTTING THE SIDE OF EACH OF THE SLEEVES OPPOSITE THE DIAPHRAGM, A MAGNET MOUNTED ON EACH OF THE END PLATES AND EXTENDING TOWARD THE DIPHRAGM, AND A COIL DISPOSED ABOUT EACH OF THE MAGNETS.
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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) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |