Cleaning method and an apparatus thereof
US5104454A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1988 |
| Grant date | Apr 14, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23G5/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The cleaning method of the present invention comprises; (a) immersing a material to be cleaned in a mixed solvent contained in the first open vessel, wherein the mixed solvent consists of a chlorofluoro-hydrocarbon with a boiling point of 20.degree.-50.degree. C. and an organic solvent with a boiling point of 50.degree. C. or more higher than that of said chlorofluoro-hydrocarbon and compatible therewith, but not azeotropic therewith, and kept at a temperature within a range between the boiling point of the chlorofluoro-hydrocarbon and a temperature of at least 30.degree. C. lower than the boiling point of the organic solvent, (b) then transferring the material into a boiling liquid essentially consisting of said chlorofluoro-hydrocarbon contained in the second open vessel, (c) and taking out the material from the boiling liquid, (d) wherein, constituting a saturated vapor zone of the chlorofluoro-hydrocarbon by the evaporated vapor from the boiling liquid essentially consisting of the chlorofluoro-hydrocarbon and the mixed solvent in an open container equipped with cooling apparatus in the upper part and holding the open vessels in the lower part, (e) and keeping a constant state …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.