Method for etching apertures into a strip of nickel-iron alloy
US4482426A · kind A · utility
14Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1984 |
| Grant date | Nov 13, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F1/28
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for etching a strip of iron-nickel alloy, such as invar steel, having etch-resistant stencils on opposite major surfaces thereof includes contacting the stencilled surfaces with a ferric-chloride etchant. The etchant is controlled (a) to contain not more than 5 molar percent nickel ion with respect to the total content of nickel and iron ions, (b) to have a specific gravity greater than about 1.495 (48.degree. Baume) (c) and to have a temperature greater than 70.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.