US3979614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DT cut, contour mode piezoelectric crystal
Assignee: KINSEKISHA LABS Ltd
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Filing: 1974-10-21
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Granted: 1976-09-07
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Expires: 1994-10-21
Abstract
Abstract In a crystal element of the type wherein a DT-cut crystal element is used to generate vibrations of the contour mode, one side of the crystal element is flat and the thickness of the element is gradually decreased from the center toward the periphery thereof.
Inventors
- 👤 Satoshi Toyoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:24
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/19
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
In a crystal element wherein said crystal element is formed with DT-cut angle in a circular shape for generating vibrations in the contour mode, characterized in that the thickness of said crystal element is gradually decreased from the center toward the periphery thereof, electrodes being applied to the surfaces of said element opposed to each other, supporting and power conductors being connected to the center of said electrodes.
Claim 2
Dependent Claim
68 words
In a crystal element wherein said crystal element is formed with DT-cut angle in a circular shape for generating vibrations in the contour mode, characterized in that the thickness of said crystal element is gradually decreased from the center toward the periphery thereof, electrodes being applied to the surfaces of said element opposed to each other, supporting and power conductors being connected to the center of said electrodes.
Claim 3
Dependent Claim
15 words
The crystal element according to claim 1 wherein two surfaces of said element are convexed.
Claim 4
Dependent Claim
23 words
The crystal element according to claim 1 wherein one side of said crystal element is convexed and the other side thereof is flat.
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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |