Patent US3748166A successfully refreshed from Google Patents.
US3748166A
Expired / Lapsed
US
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Electroless plating process employing solutions stabilized with sulfamic acid and salts thereof
Assignee: Crown City Plating Co
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Filing: 1972-09-06
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Granted: 1973-07-24
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Expires: 1992-09-06
Abstract
Abstract A PROCESS IN WHICH SULFAMIC ACID AND ITS SALTS ARE USED TO STABILIZE ALKALINE ELECTROLESS COPPER PLATING SOLUTIONS AGAINST DECOMPOSITION. WHEN EMPOLYED IN THE SECOND BATH OF A TWO-BATH ELECTROLESPLATING SYSTEM, THE PRESENCE OF SULFAMIC ACID AND ITS SALTS PERMITS RAPID DEPOSITION, OVER A BOARD RANGE OF CONCENTRATIONS, OF COPPER ONTO AN INITIAL COPPER OR NICKEL PLATE, WHILE PREVENTING DEPOSITION OF COPPER ONTO A NOBLE METAL CATALYZED SURFACE. THE STABILIZERS ALSO SERVE TO SUPPLEMENT SINGLE-BATH ELECTROLESS COPPER PLATING PROCESSES.
Inventors
- 👤 L Kadison
- 👤 E Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:40
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; C23C18/40
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |