Method of electrolytically marking metallic articles
US4067790A · kind A · utility
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2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1976 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | Nov 8, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25F3/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a known method of electrolytically marking metallic articles a hood having its bottom closed by a stencil with perforations is partially filled with an electrolyte and contains a cathode. An article to be marked is brought into contact with the stencil and constitutes the anode. The invention consists in maintaining the space within the hood at a partial vacuum sufficient to cause bubbles of air which have passed through the perforations in the stencil to flow upward in the hood, thus preventing electrolyte from seeping downward through said perforations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.