Patent US4638205A successfully refreshed from Google Patents.
US4638205A
Expired / Lapsed
US
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Piezo-electric transducer
Assignee: TDK Corp
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Filing: 1981-04-27
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Granted: 1987-01-20
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Expires: 2001-04-27
Abstract
Abstract A piezo-electric transducer includes a piezo-electric ceramic sheet bonded to a vibrating reed and one or more electrodes bonded to the piezo-electric ceramic sheet, wherein said vibrating reed has a plurality of through-holes on a vibrational nodal line for vibration of the vibrating reed.
Inventors
- 👤 Hideo Fujita
- 👤 Yuichi Saito
- 👤 Masatoshi Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:34
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/12; G10K9/122
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
In a first piezo-electric transducer comprising a piezo-electric ceramic sheet bonded to a vibrating reed and one or more electrodes bonded to said piezo-electric ceramic sheet, an improvement wherein said vibrating reed has a first plurality through-holes formed on a nodal line for vibration of said vibrating reed, wherein said vibrating reed has a second plurality of through-holes which are not formed on said nodal line and wherein each of said first and second plurality of through-holes are arranged in such a manner that a spiral form of holes is formed from the center to the peripheral part of said vibrating reed.
Claim 2
Dependent Claim
102 words
In a first piezo-electric transducer comprising a piezo-electric ceramic sheet bonded to a vibrating reed and one or more electrodes bonded to said piezo-electric ceramic sheet, an improvement wherein said vibrating reed has a first plurality through-holes formed on a nodal line for vibration of said vibrating reed, wherein said vibrating reed has a second plurality of through-holes which are not formed on said nodal line and wherein each of said first and second plurality of through-holes are arranged in such a manner that a spiral form of holes is formed from the center to the peripheral part of said vibrating reed.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |