Preconditioner concentrate
Abstract
Abstract SURFACES OF ELECTRICAL INSULATING SYNTHETIC RESIN MATERIAL, ESPECIALLY REINFORCED EPOXY SURFACES, ARE PRECONDITIONED WITHOUT SEVERLY ATTACHING, ROUGHENING AND/OR DISTORTING THE SURFACES BY CONTACTING THE SURFACES WITH AN ACIDIC SOLUTION CONTAINING A FIVE-MEMBERED NITROGEN HETEROCYCLIC COMPOUND, FOR EXAMPLE 2-PYRROLIDONE, UNTIL THE SURFACES ARE RENDERED CONDITIONABLE BY A STRONG ACID AQUEOUS OXIDIZING CONDITIONING SOLUTION. THE RESULTING CONDITIONABLE SURFACES ARE THEN CONDITIONED BY CONTACT WITH THE STRONG ACID AQUEOUS OXIDIZING SOLUTION, FOLLOWED BY ELECTROLESS METAL PLATING OF THE SURFACES TO OBTAIN A SMOOTH CHEMICAL REDUCTION METAL DEPOSIT THEREON WHICH IS OF ACCEPTABLE APPEARENCE AND FIRMLY ADHERED TO THE SURFACES. THE INVENTION IS ESPECIALLY USEFUL IN THE PREPARATION OF ADDITIVE-TYPE PRINTED CIRCUIT BOARDS.
Inventors
- 👤 C Mallico
Bibliographic Details
Claims Analysis
Total Claims: 0References 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 |