Number | Name | Date | Kind |
---|---|---|---|
4231890 | Yagi et al. | Nov 1980 | |
5118322 | Wasinger et al. | Jun 1992 | |
5171332 | Spencer, III | Dec 1992 | |
5199957 | Pascoe | Apr 1993 |
Entry |
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Hawley's Condensed Chemical Dictionary 11th Ed 1990 Van Nostrand Reinhold Publ., p. 947, "Polyvinylpyrrolidone". |