Method for removing extraneous matter by using fluorine-containing solution
US6315834A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 25, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Oct 25, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G1/24
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for removing extraneous matters from a stainless device is provided. The method includes the steps of (a) providing a container for holding a fluorine-containing neutral solution therein, (b) immersing said stainless device in said fluorine-containing neutral solution to remove said extraneous matters from said stainless device, and (c) heating and swirling said fluorine-containing solution. The fluorine-containing neutral solution is made from neutralizing hydrofluoric acid (HF) with ammonium hydroxide (NH.sub.4 OH), neutralizing hydrofluoric acid (HF) with ammonium fluoride (NH.sub.4 F), or dissolving ammonium acid fluoride (NH.sub.4 F) in a deionized water (DIW).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.