Water filter device
US4025438A · kind A · utility
25Cited by
10References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Feb 10, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D35/043
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In accordance with the invention there is provided a water filter and water filter cartridge having an upper water filtering layer containing charcoal particles, a lower filtering layer having a submicron pore size and an intermediate filtering layer having a pore size greater than that of the lower layer but less than the particle size of the charcoal in the upper layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.