Patent US3922489A successfully refreshed from Google Patents.
US3922489A
Expired / Lapsed
US
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Echo microphone of the handy type
Assignee: Hosiden Electronics Co Ltd
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Filing: 1974-01-29
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Granted: 1975-11-25
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Expires: 1994-01-29
Abstract
Abstract Echo microphone of the handy type having means for obtaining reverberation signal which comprises a diaphragm, a microphone unit and an elongated reverberation spring which is connected mechanically with said diaphragm and said microphone unit.
Inventors
- 👤 Shin Ojima
- 👤 Tooru Yoshimura
- 👤 Kazuhiko Oogami
- 👤 Aitaka Umezaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:47
CPC Classifications
G; G10; G10K; G10K15/00; G10K15/08; G10K15/10; H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/227; H04R7/00
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
125 words
An echo microphone of the handy type comprising a housing suitable for grasping with a front opening end for receiving sound and a rear end, a first diaphragm fixed to close the front opening end of the housing, a second diaphragm spaced from the first diaphragm at a predetermined distance and fixed to the inner wall of said housing, a reverberation spring coupled between said first and second diaphragm, and a microphone unit disposed at the rear end of said housing and having a third diaphragm spaced from the second diaphragm at a predetermined distance, the diameter of the third diaphragm being substantially the same as the inner diameter of the housing so as to form a closed chamber between said second and third diaphragms.
Claim 2
Dependent Claim
125 words
An echo microphone of the handy type comprising a housing suitable for grasping with a front opening end for receiving sound and a rear end, a first diaphragm fixed to close the front opening end of the housing, a second diaphragm spaced from the first diaphragm at a predetermined distance and fixed to the inner wall of said housing, a reverberation spring coupled between said first and second diaphragm, and a microphone unit disposed at the rear end of said housing and having a third diaphragm spaced from the second diaphragm at a predetermined distance, the diameter of the third diaphragm being substantially the same as the inner diameter of the housing so as to form a closed chamber between said second and third diaphragms.
Claim 3
Dependent Claim
35 words
An echo microphone of the handy type according to claim 1, wherein said first and second diaphragms have first and second recesses, respectively, and said reverberation spring is coupled between said first and second recesses.
References Cited (Backward Citations)
DE1167551B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |