Patent US2847326A successfully refreshed from Google Patents.
US2847326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microphone comprising a magnet system
Assignee: US Philips Corp
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Filing: 1952-07-28
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Granted: 1958-08-12
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Expires: 1972-07-28
Abstract
No abstract record available.
Inventors
- 👤 Muller Friedrich Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:15
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
AN EXCHANGABLE MICROPHONE ASSEMBLY COMPRISING A SUPPORT, A HOUSING INCLUDING A PORTION PERMEABLE TO SOUND WAVES, A MICROPHONE MAGNETIC SYSTEM HAVING A CENTRAL CAVITY DISPOSED IN SAID HOUSING AND COMPRISING A PERMANENT MAGNET IN ENGAGEMENT WITH SAID CAVITY FOR PRODUCING A MAGNETIC FIELD, A COIL DISPOSED IN SAID FIELD, AND A DIAPHRAGM SECURED TO SAID HOUSING AND SAID COIL AND RESPONSIVE TO SOUND WAVES PASSING THROUGH THE PERMEABLE PORTION OF SAID HOUSING, SAID PERMANENT MAGNET BEING RIGIDLY SECURED TO SAID SUPPORT, SAID HOUSING BEING DETACHABLY SECURED TO SAID SUPPORT.
Claim 2
Dependent Claim
89 words
AN EXCHANGABLE MICROPHONE ASSEMBLY COMPRISING A SUPPORT, A HOUSING INCLUDING A PORTION PERMEABLE TO SOUND WAVES, A MICROPHONE MAGNETIC SYSTEM HAVING A CENTRAL CAVITY DISPOSED IN SAID HOUSING AND COMPRISING A PERMANENT MAGNET IN ENGAGEMENT WITH SAID CAVITY FOR PRODUCING A MAGNETIC FIELD, A COIL DISPOSED IN SAID FIELD, AND A DIAPHRAGM SECURED TO SAID HOUSING AND SAID COIL AND RESPONSIVE TO SOUND WAVES PASSING THROUGH THE PERMEABLE PORTION OF SAID HOUSING, SAID PERMANENT MAGNET BEING RIGIDLY SECURED TO SAID SUPPORT, SAID HOUSING BEING DETACHABLY SECURED TO SAID SUPPORT.
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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) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |