Chelate-forming filter, process for producing the same, and method of purifying liquid using the filter
US6872317B1 · kind B1 · utility
7Cited by
3References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1999 |
| Grant date | Mar 29, 2005 |
| Priority date | — |
| Expiry date | Apr 16, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D39/1607
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A chelate-forming filter which comprises a filter medium made of natural, regenerated, or synthetic fibers wherein the fiber molecules have, incorporated therein, chelate-forming functional groups represented by general formula (1) [wherein G represents a residue of a chain sugar alcohol or of a polyhydric alcohol; and R represents hydrogen, (lower) alkyl, or -G (wherein G has the same meaning as the above G, and the two G's may be the same or different)] or (3) (wherein R1, R2, and R3 each represents lower alkylene; and n is an integer of 1 to 4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.