Filter device
US4671869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | May 30, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/24
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A filter device suitable for use in cleaning dampening water used in an offset press. The filter device has a tank in which are defined three sections: a stirring tank section, a floating tank section and a discharging tank section. The floating tank section and the discharging tank section are communicated with each other through a passage at their lower regions. The passage is adapted to be selectively closed by a shut-off device which is operated periodically under the control of a timer. A floating contaminant removing opening es positioned above the water level in the floating tank section. The contaminated water is poured into the stirring tank section through a bubbling means so that contaminants are adsorbed by the bubbles. The bubbles adsorbing the contaminants are allowed to float in the upper region of water in the floating tank section. When the passage is shut off by the shut-off device, the water level in the floating tank section is raised so that the contaminants are removed together with the bubbles through the floating matter removing opening. On the other hand, the cleaned water free of contaminants flows into the discharging tank section through the passage and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.