US3141070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodynamic microphone
Assignee: US Philips Corp
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Filing: 1960-06-07
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Granted: 1964-07-14
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Expires: 1980-06-07
Abstract
No abstract record available.
Inventors
- 👤 Schenkel Gerrit
- 👤 Haan Jacob Izaak De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:48
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
AN ELECTRODYNAMIC MICROPHONE ADAPTED TO CONVERT SOUND WAVES OCCURRING IN AN AIR MEDIUM EXTERNAL THERETO, SAID MICROPHONE COMPRISING, IN COMBINATION, A VIBRATORY SYSTEM INCLUDING A DIAPHRAGM HAVING FIRST AND SECOND SIDES, SAID FIRST SIDE BEING ACCESSIBLE TO SAID EXTERNAL AIR MEDIUM AND SAID SOUND WAVES OCCURRING THEREIN, A MAGNETIC CORE HAVING A DUCT DISPOSED THEREIN HAVING FIRST AND SECOND OPENINGS COMMUNICATING, RESPECTIVELY, WITH SAID SECOND SURFACE AND DIRECTLY WITH SAID EXTERNAL AIR MEDIUM, MAGNETIC HOUSING MEANS ENCLOSING SAID CORE AND FORMING THEREWITH AN AIR CHAMBER HAVING A GIVEN COMPLIANCE AND HAVING AT LEST ONE FIRST APERTURE AND AT LEAST AND SAID EXTERNAL AIR MEDIUM, RESPECTIVELY, MEANS FOR TERMINATING SAID SECOND OPENING OF SAID DUCT AND SAID SECOND APERTURE IN ACOUSTICAL RESISTANCES HAVING A PREDETERMINED RATIO WITH RESPECT TO EACH OTHER TO PROVIDE A PREDETERMINED DIRECTIONAL CHARACTERISTIC FOR A GIVEN FREQUENCY CHARACTERISTIC, SAID GIVEN FREQUENCY CHARACTERISTIC INCLUDING THE LOW FREQUENCY RANGE OF THE ACOUSTICAL FREQUENCY SPECTRUM.
Claim 2
Dependent Claim
155 words
AN ELECTRODYNAMIC MICROPHONE ADAPTED TO CONVERT SOUND WAVES OCCURRING IN AN AIR MEDIUM EXTERNAL THERETO, SAID MICROPHONE COMPRISING, IN COMBINATION, A VIBRATORY SYSTEM INCLUDING A DIAPHRAGM HAVING FIRST AND SECOND SIDES, SAID FIRST SIDE BEING ACCESSIBLE TO SAID EXTERNAL AIR MEDIUM AND SAID SOUND WAVES OCCURRING THEREIN, A MAGNETIC CORE HAVING A DUCT DISPOSED THEREIN HAVING FIRST AND SECOND OPENINGS COMMUNICATING, RESPECTIVELY, WITH SAID SECOND SURFACE AND DIRECTLY WITH SAID EXTERNAL AIR MEDIUM, MAGNETIC HOUSING MEANS ENCLOSING SAID CORE AND FORMING THEREWITH AN AIR CHAMBER HAVING A GIVEN COMPLIANCE AND HAVING AT LEST ONE FIRST APERTURE AND AT LEAST AND SAID EXTERNAL AIR MEDIUM, RESPECTIVELY, MEANS FOR TERMINATING SAID SECOND OPENING OF SAID DUCT AND SAID SECOND APERTURE IN ACOUSTICAL RESISTANCES HAVING A PREDETERMINED RATIO WITH RESPECT TO EACH OTHER TO PROVIDE A PREDETERMINED DIRECTIONAL CHARACTERISTIC FOR A GIVEN FREQUENCY CHARACTERISTIC, SAID GIVEN FREQUENCY CHARACTERISTIC INCLUDING THE LOW FREQUENCY RANGE OF THE ACOUSTICAL FREQUENCY SPECTRUM.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-14 | 1968-01-13 | 1968-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-14 | 1972-01-13 | 1972-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-14 | 1976-01-13 | 1976-07-14 | $7700.00 | Window Closed / Lapsed |