US3696479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a piezoelectric transducer
Assignee: Zenith Electronics LLC
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Filing: 1970-10-22
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Granted: 1972-10-10
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Expires: 1990-10-22
Abstract
Abstract For connecting external leads to miniature solid-state devices of the type wherein an electric circuit element is photoetched, printed or otherwise bonded upon a substrate surface, lands are embedded in the substrate and exposed to the circuit supporting surface of the substrate. The lands provide a surface large enough to enable the circuit elements and external leads to be individually connected to separated regions of the exposed portion or portions of the lands.
Inventors
- 👤 Fleming Dias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:58
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/08; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49007; Y10T29/4998; Y10T29/49993
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
In a method of making a miniature surface wave filter device or the like having a plurality of electro-acoustic transducers, the steps comprising: providing a relatively thin substrate composed of a piezoelectric material; forming an electrically conductive and mechanically connective land on said substrate for connecting a lead to said device comprising the steps of: forming an indentation in a surface of said substrate at the desired location of said land, filling said indentation with a metallic alloy paste, drying said paste to reduce the paste to a solidified alloy, and p1 lapping and polishing a portion of said substrate surface together with the exposed portion of said alloy to form a continuous surface on said substrate of sufficient smoothness to propagate surface waves without substantial scattering thereof and with the exposed portion of said alloy flush and coplanar with the substrate surface; and depositing a periodic pattern of electrically conductive elements on said polished portion of said substrate and extending on to a fractional part of said exposed portion of said alloy to produce an electro-acoustic transducer for generating or receiving surface waves.
Claim 2
Dependent Claim
184 words
In a method of making a miniature surface wave filter device or the like having a plurality of electro-acoustic transducers, the steps comprising: providing a relatively thin substrate composed of a piezoelectric material; forming an electrically conductive and mechanically connective land on said substrate for connecting a lead to said device comprising the steps of: forming an indentation in a surface of said substrate at the desired location of said land, filling said indentation with a metallic alloy paste, drying said paste to reduce the paste to a solidified alloy, and p1 lapping and polishing a portion of said substrate surface together with the exposed portion of said alloy to form a continuous surface on said substrate of sufficient smoothness to propagate surface waves without substantial scattering thereof and with the exposed portion of said alloy flush and coplanar with the substrate surface; and depositing a periodic pattern of electrically conductive elements on said polished portion of said substrate and extending on to a fractional part of said exposed portion of said alloy to produce an electro-acoustic transducer for generating or receiving surface waves.
Claim 3
Dependent Claim
24 words
The method as defined in claim 1 wherein said indentation is formed on only that surface of said substrate which includes said polished portion.
Claim 4
Dependent Claim
45 words
The method as defined in claim 1 wherein said indentation extends entirely through said substrate from one surface to the opposed surface and further comprising the step of forming said solidified alloy with a portion thereof projecting outwardly from said opposed surface of said substrate.
Claim 5
Dependent Claim
20 words
The method as defined in claim 3 wherein said projecting portion is formed by overfilling said indentation with said paste.
Claim 6
Dependent Claim
25 words
The method as defined in claim 3 wherein said projecting portion is formed by embedding a pin in said paste prior to said drying step.
Claim 7
Dependent Claim
27 words
The method as defined in claim 1 wherein said indentation is formed by directing a high speed stream of abrasive particles against one surface of said substrate.
Claim 8
Dependent Claim
55 words
The method as defined in claim 1 wherein the step of filling said indentation comprises the steps of: coating the substrate surface with a layer of said paste; squeegeeing the coated surface to fill the indentations and remove the excess paste from said surface; and cleaning the surface of the substrate adjacent to said indentation.
Claim 9
Dependent Claim
54 words
The method as defined in claim 1 wherein said paste is a palladium-silver alloy and said drying step comprises the sequential steps of: drying said paste for approximately 10 minutes at 100* C.; and subsequently baking said paste at a temperature in excess of 700* C. until said pAste is reduced to palladium-silver alloy.
Claim 10
Dependent Claim
26 words
The method as defined in claim 7 which further comprises the step of dipping said substrate into a bath of molten solder after said drying step.
References Cited (Backward Citations)
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |