US3668003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuits
Assignee: Cirkitrite Ltd
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Filing: 1969-11-26
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Granted: 1972-06-06
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Expires: 1989-11-26
Abstract
Abstract A METHOD IS PROVIDED FOR FORMING A CONDUCTIVE PATTERN ON A PRINTED CIRCUIT BOARD. A NON-CONDUCTIVE SUBSTRATE IS FIRST SENSITIZED OVER AN ENTIRE REGION AND AN ACTIVATING AGENT IS APPLIED AS A PATTERN WITHIN THE SENSITIZED REGION. THE ACTIVATED SUBSTRATE IS THEN IMMERSED IN AN ELECTROLESS PLATING SOLUTION TO DEPOSIT A METAL LAYER ON THE ACTIVATED PATTERN. A HEAVIER LAYER OF METAL MAY THEN BE APPLIED TO THE CONDUCTIVE PATTERN BY AN ELECTROLYTIC PROCESS.
Inventors
- 👤 Ralph William Furness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:42
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1603; C23C18/1607; C23C18/1608; C23C18/18; C23C18/20; C23C18/28; C23C18/285; C23C18/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |