Combined AC and DC etching of aluminum foil
US4437955A · kind A · utility
6Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1983 |
| Grant date | Mar 20, 1984 |
| Priority date | — |
| Expiry date | Jul 5, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12431
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Aluminum foil exhibiting a good combination of capacitance and mechanical strength is produced by an etching procedure that includes the steps of AC pre-etching aluminum foil in an acid bath containing hydrochloric acid and then, without removing the hydrochloric acid from the foil, etching the foil with a high density DC while the foil is immersed in an aqueous solution of sodium chloride and sodium sulfate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.