Patent US3573672A successfully refreshed from Google Patents.
US3573672A
Expired / Lapsed
US
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Crystal filter
Assignee: AT&T Inc
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Filing: 1968-10-30
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Granted: 1971-04-06
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Expires: 1988-10-30
Abstract
Abstract The coupling between two loosely coupled electrode pairs mounted on the same crystal body to form a monolithic filter is vernier adjusted by plating an area in the interelectrode region.
Inventors
- 👤 Irvin E Fair
- 👤 Edwin C Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:05
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56; H03H9/566; H03H3/00; H03H3/007; H03H3/02; H03H3/04; H03H2003/0414
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, and material means deposited between said plate means thereby altering the mass of said body.
Claim 2
Dependent Claim
92 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, and material means deposited between said plate means thereby altering the mass of said body.
Claim 3
Dependent Claim
122 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, said body including a wafer, said plate means each including a pair of electrodes on opposite faces of said wafer, said wafer comprising an AT-cut for vibrations in a tHickness shear mode, and material means in the shape of a strip deposited on said wafer.
Claim 4
Dependent Claim
122 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, said body including a wafer, said plate means each including a pair of electrodes on opposite faces of said wafer, said wafer comprising an AT-cut for vibrations in a tHickness shear mode, and material means in the shape of a strip deposited on said wafer.
Claim 5
Dependent Claim
108 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, and material means in the shape of a strip deposited on said body thereby to alter the mass of said body whereby translated energy is conformed to a given energy band.
Claim 6
Dependent Claim
108 words
An energy translating device comprising a crystal body, first plate means on said body for interacting with acoustical energy in said body, second plate means on said body and spaced from said first plate means for interacting with acoustical energy in said body, said plate means when said body is excited forming respective mutually coupled resonators together exhibiting interdependent resonant frequencies whereby an energy band may be translated between said resonators, said body having a continuous mass, and material means in the shape of a strip deposited on said body thereby to alter the mass of said body whereby translated energy is conformed to a given energy band.
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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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |