US3674485A
Expired / Lapsed
US
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Method of manufacturing electrically conducting metal layers
Assignee: US Philips Corp
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Filing: 1968-09-18
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Granted: 1972-07-04
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Expires: 1988-09-18
Abstract
Abstract ELECTRICALLY CONDUCTIVE METAL PATTERNS ARE PRODUCED BY EXPOSING A HOMOGENEOUS MIXTURE OF A HYDROPHOBIC RESINOUS BINDING AGENT AND A LIGHT-SENSITIVE SEMICONDUCTIVE OXIDE SUCH AS TITANIUM DIOXIDE TO LIGHT, TREATING THE EXPOSED AREAS WITH A COPPER SOLUTION OR A SOLUTION OF A METAL AT LEAST AS HIGH AS COPPER IN THE E.M.F. SERIES TO FORM A METAL NUCLEI IMAGE, AND THEN INTENSIFYING THE NUCLEI IMAGE BY THE USE OF A STABILIZED PHYSICAL DEVELOPER OR BY THE USE OF AN ELECTROLESS COPPER, COBALT OR NICKELPLATING BATH.
Inventors
- 👤 Hendrik Jonker
- 👤 Casper Johannes
- 👤 Gerardus Ferdinand Janssen
- 👤 Lambertus Postma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:02
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/105; H05K3/106; G; G03; G03C; G03C1/00; G03C1/705; G03C5/00; G03C5/58; H05K3/18; H05K3/181; H05K3/182; H05K3/185
Claims Analysis
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |