Number | Name | Date | Kind |
---|---|---|---|
2157511 | Urbain et al. | May 1939 | |
3526320 | Kryzer | Sep 1970 | |
3639231 | Bresler | Feb 1972 | |
3715287 | Johnson | Feb 1973 | |
3823086 | Schmidt | Jul 1974 | |
3836458 | Wallis et al. | Sep 1974 | |
3973987 | Hewitt et al. | Aug 1976 |
Entry |
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"Potable Water from Hospital Wastes by Reverse Osmosis", Chem. Eng. Prog. Symposium Series, vol. 64, No. 90, 1968, A. Gouveia et al. |
"Polymetrics Reverse Osmosis for High Purity Water", Polymetrics, Inc., received 9/15/1970, pp. 1-6. |