Patent US2780502A successfully refreshed from Google Patents.
Patent US3600245A successfully refreshed from Google Patents.
US3600245A
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Aluminum etch process
Assignee: HOWARD W GATES
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Filing: 1968-03-06
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Granted: 1971-08-17
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Expires: 1988-03-06
Abstract
Abstract A PROCESS FOR INCREASING THE SURFACE AREA OF ALUMINUM WHEREIN A GALVANIC COUPLE IS FORMED BETWEEN A SURFACE OF THE ALUMINUM AND AN OVERCOATING OF A METAL THAT IS MORE ELECTRONEGATIVE THAT ZINC; THE OVERCOATING IS ACID-WASHED TO FINELY ETCH THE ALUMINUM SURFACE. IN A SPECIFIC EXAMPLE, ZINC IS FIRST DEPOSITED ON THE SURFACE OF HIGH PURITY ALUMINUM FOIL, FROM A SOLUTION OF ZINC OXIDE IN SODIUM HYDROXIDE. COPPER IS THEN DEPOSITED FROM AN AQUEOUS SOLUTION OF CUPRIC CHLORIDE. THE RESULTANT SURFACE IS ACIDWASHED WITH AQUEOUS HYDROCHLORIC ACID CONTAINING A CATALYTIC AMOUNT OF FERRIC CHLORIDE, FOLLOWED BY A NITRIC ACID BATH.
Inventors
- 👤 Howard W Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:57
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/048; H01G9/055; C; C23; C23F; C23F1/00
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |