US4259435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Additive method of manufacturing metal patterns on synthetic resin substrates
Assignee: US Philips Corp
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Filing: 1979-06-21
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Granted: 1981-03-31
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Expires: 1999-06-21
Abstract
Abstract Additive method of manufacturing metal patterns on synthetic resin substrates, printed circuits in particular. A nuclear image of a desired pattern is obtained by means of a salt of a metal which may occur in more than one valency and a noble metal salt by inactivating the substrate area outside the desired pattern by photo-oxidation by means of exposure to light in the presence of oxygen. The ultimate metal pattern is deposited by electroless metal deposition on the nuclear image.
Inventors
- 👤 Dirk J. Broer
- 👤 Arnoldus J. M. van den Broek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:59
CPC Classifications
G; G03; G03C; G03C5/00; H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/185
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
A method of forming a metal pattern on a substrate of which at least one major surface is formed of a synthetic resin comprising: (a) irradiating a synthetic resin surface of said substrate with actinic light in accordance with the negative of the desired metal pattern in the presence of oxygen so as to form peroxide groups on the exposed surface of the synthetic resin; (b) contacting the irradiated synthetic resin surface with a solution or dispersion of an oxide or salt of a metal capable of occurring in a higher valence state then present in said oxide or salt, said oxide or salt being capable of reducing noble metal ions to metal, thereby rendering the irradiated areas of said synthetic resin surface inactive; (c) contacting the thus treated synthetic resin surface with a solution containing noble metal ions thereby forming a nuclear noble metal image in a pattern of the desired metal pattern; and (d) intensifying said nuclear noble metal image by an electroless metal deposition so as to form the desired metal pattern.
Claim 2
Independent Claim
175 words
A method of forming a metal pattern on a substrate of which at least one major surface is formed of a synthetic resin comprising: (a) irradiating a synthetic resin surface of said substrate with actinic light in accordance with the negative of the desired metal pattern in the presence of oxygen so as to form peroxide groups on the exposed surface of the synthetic resin; (b) contacting the irradiated synthetic resin surface with a solution or dispersion of an oxide or salt of a metal capable of occurring in a higher valence state then present in said oxide or salt, said oxide or salt being capable of reducing noble metal ions to metal, thereby rendering the irradiated areas of said synthetic resin surface inactive; (c) contacting the thus treated synthetic resin surface with a solution containing noble metal ions thereby forming a nuclear noble metal image in a pattern of the desired metal pattern; and (d) intensifying said nuclear noble metal image by an electroless metal deposition so as to form the desired metal pattern.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein the substrate consists of a support material upon which is present a coating of p-xylylene polymer formed by means of vapor deposition.
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) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |