Electroless copper plating
Abstract
Abstract A CHEMICAL REDUCTION COPPER PLATING COLUTION OF IMPROVED STABILITY COMPRISING COPPER IONS, FORMALDEHYDE AS REDUCING AGENT FOR THE COPPER IONS, ROCHELLE SALT IS COMPLEXING AGENT FOR THE COPPER IONS, SODIUM HYDROXIDE OR POTASSIUM HYDROXIDE, AND ADDITIONAL METHANOL IN AMOUNT TO PROVIDE AN EXCESS OF METHANOL SUFFICIENT TO SHIFT THE EQUILIBRIUM OF A CANNIZZARO SIDE REACTION IN THE DIRECTION OF THE REACTANTS, THE SOLUTION BEING FREE OF AN AMINE SUCH AS TRIETHANOLAMINE. BY REASON OF (1) THE EXCESS OF METHANOL SUFFICIENT TO SHIFT THE EQUILIBRIUM OF THE CANNIZZARO REACTION TO THE LEFT, (2) ROCHELLE SALT AS COMPLEXER FOR THE IONIC COPPER AND WHICH APPEARS TO FORM A WEAKER COMPLEX WITH THE IONIC COPPER THAN EDTA, AND (3) THE ABSENCE OF AN AMINE SUCH AS TRIETHANOLAMINE OR DIETHYLAMINE FORM THE SOLUTION AND WHICH IS PRESENT IN PRIOR ART ELECTROLESS COPPER SOLUTIONS, ELECTROLESS COPPER PLATING SOLUTIONS ARE PROVIDED OF CONSIDERABLY LONGER LIFE THAN THOSE OF THE PRIOR ART AND WHICH EFFECTIVELY PLATE COPPER AT MATERIALLY LOWER SOLUTION TEMPERATURES THAN THE TEMPERATURES REQUIRED BY THE PRIOR ART ELECTROLESS COPPER PLATING SOLUTIONS.
Inventors
- 👤 John L Morico
- 👤 Howard W Pender
Bibliographic Details
Claims Analysis
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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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |