Patent US3763446A successfully refreshed from Google Patents.
US3763446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency multi-resonator of trapped energy type
Assignee: Murata Manufacturing Co Ltd
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Filing: 1972-03-31
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Granted: 1973-10-02
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Expires: 1992-03-31
Abstract
Abstract A high frequency piezoelectric multi-resonator of trapped energy type for use in an electric filter circuit comprises a thin wafer and two or more electrode units disposed on the wafer wherein a barrier for preventing vibrations from being transmitted from one of these electrode units to another through the wafer is provided for improving the spurious response characteristic of the multiresonator.
Inventors
- 👤 I Toyoshima
- 👤 H Ishiyama
- 👤 K Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
A high-frequency multi-resonator of trapped energy type for use in an electric circuit comprising: a thin wafer of piezoelectric material; at least two spaced apart electrode units provided on said wafer; and a barrier formed in said wafer in the form of an elongated slot passing completely through said wafer and extending through an intermediate portion between said two electrode units so that a line from any position on one of said electrode units to any position on the other of said two electrode units is intersected by said slot, whereby a resonant interaction between said two electrode units during the operation of said multi-resonator can be reduced or substantially eliminated.
Claim 2
Dependent Claim
111 words
A high-frequency multi-resonator of trapped energy type for use in an electric circuit comprising: a thin wafer of piezoelectric material; at least two spaced apart electrode units provided on said wafer; and a barrier formed in said wafer in the form of an elongated slot passing completely through said wafer and extending through an intermediate portion between said two electrode units so that a line from any position on one of said electrode units to any position on the other of said two electrode units is intersected by said slot, whereby a resonant interaction between said two electrode units during the operation of said multi-resonator can be reduced or substantially eliminated.
Claim 3
Dependent Claim
19 words
A high frequency multi-resonator as claimed in claim 1, wherein the width of said slot is approximately 0.5 mm.
Claim 4
Dependent Claim
31 words
A high frequency multi-resonator as claimed in claim 1, wherein said two electrode units are positioned on both sides of said slot in equally spaced relationship with respect to said slot.
Claim 5
Dependent Claim
105 words
A high-frequency multi-resonator as claimed in claim 1, wherein each electrode unit comprises a first circularly shaped electrode element disposed on one surface of said wafer and a second circularly shaped electrode element of the same diameter as said first element disposed opposite said first element on the other side of said wafer therefrom, said second element having a separating gap therein, so as to be formed of a pair of arcuate-shaped electrodes separated from each other on said other side of said first electrode element and wherein the length of the slot is greater than the diameter of any one of the electrode units.
Claim 6
Dependent Claim
56 words
A high frequency multi-resonator as claimed in claim 1, wherein the minimum distance between one of the electrode units to one of the lengthwise edges of the slot adjacent to said one of said electrode units is such thAt a ratio of the thickness of the wafer to said minimum distance is preferably more than 10.
Claim 7
Dependent Claim
19 words
A high frequency multi-resonator as claimed in claim 1, wherein the number of said slots is more than two.
Claim 8
Dependent Claim
36 words
A high frequency multi-resonator as claimed in claim 1, wherein said slot is formed by the use of a cutting machine having a rotary disc of the thickness substantially equal to the width of said barrier.
Claim 9
Dependent Claim
17 words
A high frequency multi-resonator as claimed in claim 5, wherein said wafer is made of ceramic material.
Claim 10
Dependent Claim
40 words
A high frequency multi-resonator according to claim 1, wherein said slot is an elongated slot extends from one edge of said wafer to a portion thereof separated from said one edge and adjacent a second edge opposite said one edge.
Claim 11
Dependent Claim
23 words
A high frequency multi-resonator as claimed in claim 1, wherein said slot extends between portions of said wafer adjacent the opposed edges thereof.
Claim 12
Dependent Claim
33 words
A high frequency multi-resonator as claimed in claim 1, wherein said electrode units are circularly shaped and said slot is elongated and has a length greater than the diameter of an electrode unit.
Claim 13
Dependent Claim
20 words
A high frequency multi-resonator as claimed in claim 1, wherein said slot is in the form of a ring-shaped opening.
Claim 14
Dependent Claim
15 words
A high frquency multi-resonator as claimed in claim 1, wherein said wafer is circularly shaped.
Claim 15
Dependent Claim
16 words
A high frequency multi-resonator as claimed in claim 13, wherein said electrode units are circularly shaped.
Claim 16
Dependent Claim
71 words
A high-frequency multi-resonator as claimed in claim 4, further including first electrical conductive means disposed on said one surface of said wafer for electrically connecting said first circularly shaped electrode elements together and second electrical conductive means disposed on said other surface of said wafer for electrically connecting the electrodes of said pairs making up said second electrode elements which are arranged opposite each other on either side of said slot.
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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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |