Patent US3872331A successfully refreshed from Google Patents.
US3872331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packaged surface wave selective circuit device and method of making the same
Assignee: Zenith Electronics LLC
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Filing: 1973-06-04
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Granted: 1975-03-18
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Expires: 1993-06-04
Abstract
Abstract Semiconductor packaging structures and methods are modified to permit packaging of surface wave selective devices to provide convenient electrical and mechanical interfacing. Distinctive reference locations are included for the precision location of the surface wave device within the container. A gasket, having integral dampening elements which supply end region attenuation of the surface waves, is employed to provide a seal for the container.
Inventors
- 👤 Guy N Falco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:39
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/058; H10; H10W; H10W76/00; H10W76/10; H10W76/12; H10W76/15; H10W76/157; H10W72/00; H10W72/50; H10W72/541; H10W72/5445; H10W72/90; H10W72/931; H10W72/932
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
240 words
A method for packaging a surface wave selective device to provide for convenient electrical and mechanical interfacing with associated Circuit devices comprising: printing electrically conductive material in patterned areas on a surface of a green ceramic plate, said areas extending to an edge thereof; forming from said green ceramic plate a container defined by a major surface on which lie a plurality of conductive patterned areas extending from an edge thereof, a recess adapted to accommodate said tuned device and being electrically interconnected with said major surface by conductive material, and at least two distinctive reference locations positioned on adjacent sides of said recess; heating said container to simultaneously cure the ceramic and fuse the electrically conductive material thereto; securing said selective device within said recess; establishing electrical interconnections from said tuned element to said electrically conductive areas; providing a preformed gasket including a thermally responsive sealing material and having inwardly extending dampening elements; placing said gasket in contact with said major surface and with said indexing pads with said dampening elements overlying said tuned device in predetermined alignment therewith; placing a cured ceramic cover plate in contact with said gasket and said indexing pads; and heating the assembly above the bonding temperature of said sealing material causing activation thereof thus bonding said cover to said container and causing said integral dampening elements to bond to said tuned device to prevent undesirable end reflections in operation of said tuned device.
Claim 2
Independent Claim
240 words
A method for packaging a surface wave selective device to provide for convenient electrical and mechanical interfacing with associated Circuit devices comprising: printing electrically conductive material in patterned areas on a surface of a green ceramic plate, said areas extending to an edge thereof; forming from said green ceramic plate a container defined by a major surface on which lie a plurality of conductive patterned areas extending from an edge thereof, a recess adapted to accommodate said tuned device and being electrically interconnected with said major surface by conductive material, and at least two distinctive reference locations positioned on adjacent sides of said recess; heating said container to simultaneously cure the ceramic and fuse the electrically conductive material thereto; securing said selective device within said recess; establishing electrical interconnections from said tuned element to said electrically conductive areas; providing a preformed gasket including a thermally responsive sealing material and having inwardly extending dampening elements; placing said gasket in contact with said major surface and with said indexing pads with said dampening elements overlying said tuned device in predetermined alignment therewith; placing a cured ceramic cover plate in contact with said gasket and said indexing pads; and heating the assembly above the bonding temperature of said sealing material causing activation thereof thus bonding said cover to said container and causing said integral dampening elements to bond to said tuned device to prevent undesirable end reflections in operation of said tuned device.
Claim 3
Dependent Claim
28 words
The method of claim 1, wherein the two distinctive reference locations comprise measurement indexing pads elevated above said major surface and positioned on adjacent sides of said recess.
Claim 4
Dependent Claim
42 words
The method as described in claim 1, wherein the placing of the preformed gasket in contact with the major surface of the cured ceramic container is followed by heat sagging and pressure tacking of said integral dampening elements to said tuned device.
Claim 5
Dependent Claim
237 words
A surface wave selective circuit device adapted for electrical and mechanical interfacing with associated circuit devices comprising: a recessed ceramic container having a plurality of printed electrically conductive patterns including a ground plane on the bottom of the recess and conductive terminals extending from the recess along a predetermined surface of said ceramic container; at least two distinctive reference locations located on said ceramic container providing measurement reference points for positioning a surface wave device within the recess; a surface wave selective device, having input and output transducer terminals on an operational surface of a substrate of piezo-electric material, conductively bonded within said recess in a position providing clearance for said operational surface with the walls of said recess and with said opposed major surface electrically connected to said ground plane; means for electrically connecting said input and output transducer terminals to said conductive terminals; a preformed gasket in contact with said ceramic container and aligned with respect to said distinctive reference locations said gasket having inwardly extending dampening elements contacting the respective end regions of said operational surface of said selective device to provide controlled dampening of surface waves; and a ceramic cover plate in contact with said preformed gasket and sealed to said ceramic container to overlie said recess without contacting said surface wave selective device while permitting access to said conductive terminals to establish the required electrical connection to said surface wave selection device.
Claim 6
Dependent Claim
237 words
A surface wave selective circuit device adapted for electrical and mechanical interfacing with associated circuit devices comprising: a recessed ceramic container having a plurality of printed electrically conductive patterns including a ground plane on the bottom of the recess and conductive terminals extending from the recess along a predetermined surface of said ceramic container; at least two distinctive reference locations located on said ceramic container providing measurement reference points for positioning a surface wave device within the recess; a surface wave selective device, having input and output transducer terminals on an operational surface of a substrate of piezo-electric material, conductively bonded within said recess in a position providing clearance for said operational surface with the walls of said recess and with said opposed major surface electrically connected to said ground plane; means for electrically connecting said input and output transducer terminals to said conductive terminals; a preformed gasket in contact with said ceramic container and aligned with respect to said distinctive reference locations said gasket having inwardly extending dampening elements contacting the respective end regions of said operational surface of said selective device to provide controlled dampening of surface waves; and a ceramic cover plate in contact with said preformed gasket and sealed to said ceramic container to overlie said recess without contacting said surface wave selective device while permitting access to said conductive terminals to establish the required electrical connection to said surface wave selection device.
Claim 7
Dependent Claim
28 words
The selective circuit device as described in claim 4, wherein said preformed gasket comprises a mat of random fibrous material with a thermally responsive sealing material dispersed therein.
Claim 8
Dependent Claim
28 words
The selective circuit device as described in claim 4 wherein the edges of the dampening elements form a boundary line at A predetermined angle with the transducer fingers.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |