Patent US4460055A successfully refreshed from Google Patents.
Patent US4174469A successfully refreshed from Google Patents.
US4174469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable directivity microphone incorporated in a tape recorder casing
Assignee: Olympus Corp
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Filing: 1978-07-14
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Granted: 1979-11-13
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Expires: 1998-07-14
Abstract
Abstract A microphone device used for a tape recorder comprises a microphone body and a casing for accommodating the microphone therein. The casing is provided with acoustic inlet holes at its front wall and its side wall. The acoustic inlet holes provided on its side wall can be opened and closed by a shielding member.
Inventors
- 👤 Michio Kusuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:49
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/38; H04R1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A microphone device comprising a microphone body, a tape recorder casing for incorporating the microphone therein, said casing having a front wall and a plurality of side walls extending from said front wall, said microphone body being located adjacent said front wall, acoustic inlet holes provided in said front wall and in at least two said side walls adjacent both said front wall and said microphone body, at least two shielding plates mounted on said casing each associated with a different one of said side walls for opening and closing the acoustic inlet holes in said side wall with which said shielding plate is associated, means mounted on said casing accessible from the exterior thereof for moving said shielding plates to open and close the acoustic inlet holes so that the directionality of the microphone can be selectively obtained by the separate actuation of said shielding plates.
Claim 2
Dependent Claim
147 words
A microphone device comprising a microphone body, a tape recorder casing for incorporating the microphone therein, said casing having a front wall and a plurality of side walls extending from said front wall, said microphone body being located adjacent said front wall, acoustic inlet holes provided in said front wall and in at least two said side walls adjacent both said front wall and said microphone body, at least two shielding plates mounted on said casing each associated with a different one of said side walls for opening and closing the acoustic inlet holes in said side wall with which said shielding plate is associated, means mounted on said casing accessible from the exterior thereof for moving said shielding plates to open and close the acoustic inlet holes so that the directionality of the microphone can be selectively obtained by the separate actuation of said shielding plates.
References Cited (Backward Citations)
US3870820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |