Method for etching small-ratio apertures into a strip of carbon steel
US4600470A · kind A · utility
3Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1985 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | Apr 16, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23F1/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for etching an array of apertures through a carbon-steel sheet wherein, for each of the majority of said apertures, the ratio of the desired smallest cross-sectional dimension thereof to the thickness of said sheet is less than about 0.9, said sheet having etch-resistant stencils on opposite major surfaces thereof, said method comprising contacting said stencilled major surfaces with ferric chloride etchant having a specific gravity in a range at which a smooth finish is realized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.