US3791939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of selectively depositing a metal on a surface
Assignee: AT&T Inc
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Filing: 1972-05-15
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Granted: 1974-02-12
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Expires: 1992-05-15
Abstract
Abstract THE DESIRED METAL PATTERN. THE SELECTIVELY ULTRAVIOLET RADIATION-EXPOSED SURFACE IS THEN IMMERSED IN A SUITABLE ELECTROLESS METAL DEPOSTION SOLUTION WHEREIN AN ELECTROLESS METAL IS CATALYTICALLY REDUCED ON THE DELINEATED UNEXPOSED PATTERN. A METHOD OF DEPOSITING A METAL PATTERN ON A SURFACE OF A SUBSTRATE IS DISCLOSED. A SURFACE OF THE SUBSTRATE IS SENSITIZED WITH A PHOTOSENSITIVE SENSITIZER SELECTED FROM THE GROUP OF SENSITIZERS COMPRISING A PHOTOSENSITIVE GOLD SENSITIZER AND A PHOTOSENSITIVE PLATINUM SENSTIZER. THE SENSTIZER SURFACE IS EXPOSED TO A SOURCE OF ULTRAVIOLET RADIATION TO DELINEATE AN UNEXPOSED PATTERN CORRESPONDING TO
Inventors
- 👤 A Ferrara
- 👤 J Kenney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:12
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/185; G; G03; G03C; G03C1/00; G03C1/50; G03C5/00; G03C5/58
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |