US3554878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plating tin-lead alloy on printed circuits and electrolyte therefor
Assignee: Boeing North American Inc
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Filing: 1968-07-02
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Granted: 1971-01-12
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Expires: 1988-07-02
Abstract
Abstract A HIGH THROWING POWER TIN LEAD (SOLDER) FLUOBORATE PLATING BATH. THE BATH HAS A VERY LOW TOTAL METAL CONTENT, TYPICALLY 15 TO 30 GRAMS PER LITER, AND A HIGH FLUOBORIC ACID CONTENT, TYPICALLY 300 TO 500 GRAMS PER LITER. A SMALL WEIGHT PERCENTAGE OF PEPTONE, TYPICALLY 2 TO 10 GRAMS PER LITER COMPLETES THE SOLUTION. THE INVENTIVE PLATING BATH HAS A VERY HIGH THROWING POWER VALUE, TYPICALLY GREATER THAN 65, AND PERMITS SUBSTANTIALLY UNIFORM THICKNESS SOLDER PLATING OF PRINTED WIRING BOARDS THROUGH HOLES HAVING BOARD THICKNESS TO HOLE DIAMETER RATIOS OF 5:1 OR GREATER.
Inventors
- 👤 Bill F Rothschild
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:05
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/04; C25D3/00; C25D3/02; C25D3/56; C25D3/60; H; H05; H05K; H05K3/00; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
Total Claims: 0
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |