Patent US4159414A successfully refreshed from Google Patents.
US4159414A
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Method for forming electrically conductive paths
Assignee: Massachusetts Institute of Technology
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Filing: 1978-04-25
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Granted: 1979-06-26
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Expires: 1998-04-25
Abstract
Abstract A method for forming electrically conductive paths on a substrate wherein at least a selected surface (or surfaces) of the substrate on which the paths are to be formed is made of a composition which comprises a first material, preferably a polymer material having a metal compound, preferably a metal oxide, incorporated as a filler therein. The selected surface is heated, preferably as by a high intensity laser beam, at the locations where the paths are to be formed to a temperature sufficient to reduce the metal compound to its elemental state whereby the desired electrically conductive paths are formed
Inventors
- 👤 Nam P. Suh
- 👤 Alonso R. Ramos
- 👤 Elliot K. Chartash
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:52
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/105; B; B23; B23K; B23K26/00; B23K26/0006; B23K2103/00; B23K2103/30; B23K2103/42; H05K2203/00; H05K2203/09; H05K2203/092; H05K2203/10; H05K2203/107; H05K2203/12; H05K2203/125; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49163
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
A method for forming electrically conductive regions at selected locations on at least one surface of a substrate comprising the steps of forming at least selected portions, which contain said selected locations, of said at least one surface of said substrate of a composition comprising a matrix of a first reducing material having a metal compound incorporated as a filler therein; heating said selected locations to a temperature sufficient to reduce said metal compound to its elemental metal state whereby electrically conductive regions are formed at said selected locations on said at least one surface.
Claim 2
Independent Claim
95 words
A method for forming electrically conductive regions at selected locations on at least one surface of a substrate comprising the steps of forming at least selected portions, which contain said selected locations, of said at least one surface of said substrate of a composition comprising a matrix of a first reducing material having a metal compound incorporated as a filler therein; heating said selected locations to a temperature sufficient to reduce said metal compound to its elemental metal state whereby electrically conductive regions are formed at said selected locations on said at least one surface.
Claim 3
Independent Claim
94 words
A method for forming one or more electrically conductive paths on at least one surface of a substrate comprising the steps of forming said at least one surface of said substrate of a composition comprising a matrix of a polymer reducing material having a metal compound incorporated as a filler therein; heating said at least one surface of said substrate at selected locations where it is desired to form said one or more electrically conductive paths to a temperature sufficient to reduce said metal compound to its elemental metal state at said selected locations.
Claim 4
Independent Claim
94 words
A method for forming one or more electrically conductive paths on at least one surface of a substrate comprising the steps of forming said at least one surface of said substrate of a composition comprising a matrix of a polymer reducing material having a metal compound incorporated as a filler therein; heating said at least one surface of said substrate at selected locations where it is desired to form said one or more electrically conductive paths to a temperature sufficient to reduce said metal compound to its elemental metal state at said selected locations.
Claim 5
Dependent Claim
16 words
A method in accordance with claim 2 wherein the entire substrate is formed of said composition.
Claim 6
Dependent Claim
28 words
A method in accordance with claim 2 wherein said substrate is formed of a first material and said at least one surface thereof is coated with said composition.
Claim 7
Dependent Claim
22 words
A method in accordance with claim 3 wherein said heting step is performed by applying a laser beam to said selected locations.
Claim 8
Dependent Claim
19 words
A method in accordance with claim 5 wherein said laser beam has a beam diameter of about 3 millimeters.
Claim 9
Dependent Claim
22 words
A method in accordance with claim 3 wherein said heating step is performed by applying an electron beam to said selected locations.
Claim 10
Dependent Claim
25 words
A method in accordance with claim 2 wherein the polymer material of said composition is selected from the group consisting of polyethylenes and epoxy resins.
Claim 11
Dependent Claim
18 words
A method in accordance with claim 8 wherein the metal compound of said composition is a metal oxide.
Claim 12
Dependent Claim
27 words
A method in accordance with claim 1 wherein said metal compound is selected from the group consisting of Cu 2 O, CuO, NiO, CuCl 2 and SnO.
Claim 13
Dependent Claim
21 words
A method in accordance with claim 10 wherein said composition comprises an epoxy resin matrix having Cu 2 O incorporated therein.
Claim 14
Dependent Claim
27 words
A method in accordance with claim 2 wherein said composition incorporates said metal compound in a range from about 60% by volume to about 95% by volume.
Claim 15
Dependent Claim
19 words
A method in accordance with claim 1 wherein said composition incorporates about 75% by volume of said metal compound.
References Cited (Backward Citations)
US3056881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |