US3677950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical etching solution for printed wiring boards
Assignee: Lee Alderuccio & Associates In
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Filing: 1969-04-30
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Granted: 1972-07-18
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Expires: 1989-04-30
Abstract
Abstract A CHEMICAL ETCHING SOLUTION PARTICULARLY ADAPTED TO SELECTIVELY DISSOLVE COPPER FROM LAMINATED PRINTED WIRING BOARDS IN THE PRESENCE OF METALS SELECTED FROM THE GROUP CONSISTING OF TIN, LEAD, NICKEL, GOLD AND ALLOYS THEREOF WITHOUT CAUSING ATTACK OF SUCH METALS CONSISTS OF AN AQUEOUS AMMONIACAL SOLUTION OF A NORMALLY ACIDIC OXIDIZER, THE SOLUTION HAVING AN ALKALINE PH UP TO ABOUT 11.
Inventors
- 👤 Carmelo Leon Alderuccio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/32; C23F1/34
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |