Number | Name | Date | Kind |
---|---|---|---|
3711573 | Nagy | Jan 1973 | |
4080346 | Bedell | Mar 1978 | |
4305829 | Kelsey et al. | Dec 1981 | |
4308189 | Moritani et al. | Dec 1981 | |
4775715 | Beresniewicz et al. | Oct 1988 | |
5075401 | Zhang | Dec 1991 | |
5108622 | Liao et al. | Apr 1992 | |
5354803 | Dragner et al. | Oct 1994 |
Number | Date | Country |
---|---|---|
2214783 | Aug 1974 | FRX |
K021361 | Jan 1987 | JPX |
131003 | Jun 1987 | JPX |
Entry |
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Betz Handbook of Industrial Water Conditioning, 9th ed., 1991, Betz Laboratories, Inc., Trevose, PA, pp. 23-30. |