US4353935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a device having a conductor pattern
Assignee: US Philips Corp
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Filing: 1978-08-24
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Granted: 1982-10-12
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Expires: 1998-08-24
Abstract
Abstract The invention relates to a method in which the "lift-off" technique is used for providing a conductor pattern on a substrate, namely that variation of said technique in which a multilayer mask connected to the surface is used. According to the invention, said technique proves to be particularly suitable to obtain a multilayer conductor pattern the free surface of which of a first conductive sub-layer on the substrate is fully covered by a second conductive sub-layer.
Inventors
- 👤 Bohuslav Symersky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:23
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/04; H05K3/046; H05K3/048; H10; H10D; H10D99/00; H10P; H10P95/00; H10W; H10W20/00; H10W20/40; H10W20/482; H10W20/484; Y; Y10; Y10S; Y10S438/00; Y10S438/907; Y10S438/942; Y10S438/944; Y10S438/948; Y10S438/951
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
283 words
A method of manufacturing a device comprising a body which has a conductor pattern, comprising the steps of: (a) providing said body having a surface, (b) providing a masking layer on said surface, said masking layer comprising at least first and second masking sub-layers of respective materials differing from each other, said first masking sub-layer underlying said second masking sub-layer and being of metal, (c) providing in said masking layer recesses in the form of said conductive pattern that is to be provided, (d) etching said first masking sub-layer, using said second masking sub-layer as an etching mask for the underlying first masking sub-layer, exposing part of said body surface, (e) thereafter providing a layer of conductive material on the exposed said surface and on said masking layer, said conductive layer comprising plural conductive sub-layers of respective materials differing from each other, said step of providing said conductive layer comprising providing a first conductive sub-layer on said surface and then providing a second conductive sub-layer which covers the whole free surface of the underlying said first conductive sub-layer such that said first conductive sub-layer is completely shielded from the environment by said second conductive sublayer, and (f) then removing said masking layer and a first part of said conductive layer present on said masking layer so that a second part of said conductive layer present in said recesses of said masking layer remains on said body as said conductive pattern, wherein said step of providing said conductive layer comprises providing said first and second conductive sub-layers at different respective pressures, the pressure during the provision of said first conductive sub-layer being smaller than the pressure during the provision of said second conductive sub-layer.
Claim 2
Independent Claim
283 words
A method of manufacturing a device comprising a body which has a conductor pattern, comprising the steps of: (a) providing said body having a surface, (b) providing a masking layer on said surface, said masking layer comprising at least first and second masking sub-layers of respective materials differing from each other, said first masking sub-layer underlying said second masking sub-layer and being of metal, (c) providing in said masking layer recesses in the form of said conductive pattern that is to be provided, (d) etching said first masking sub-layer, using said second masking sub-layer as an etching mask for the underlying first masking sub-layer, exposing part of said body surface, (e) thereafter providing a layer of conductive material on the exposed said surface and on said masking layer, said conductive layer comprising plural conductive sub-layers of respective materials differing from each other, said step of providing said conductive layer comprising providing a first conductive sub-layer on said surface and then providing a second conductive sub-layer which covers the whole free surface of the underlying said first conductive sub-layer such that said first conductive sub-layer is completely shielded from the environment by said second conductive sublayer, and (f) then removing said masking layer and a first part of said conductive layer present on said masking layer so that a second part of said conductive layer present in said recesses of said masking layer remains on said body as said conductive pattern, wherein said step of providing said conductive layer comprises providing said first and second conductive sub-layers at different respective pressures, the pressure during the provision of said first conductive sub-layer being smaller than the pressure during the provision of said second conductive sub-layer.
Claim 3
Dependent Claim
42 words
A method as in claim 1, wherein the pressure during the provision of said first conductive sub-layer is 10 -6 to 10 -7 Torr and the pressure during the provision of said second conductive sub-layer is 10 -2 to 10 -3 Torr.
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) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |