Number | Name | Date | Kind |
---|---|---|---|
2797443 | Carlson, Jr. | Jul 1957 | |
3072584 | Karpovich | Jan 1963 | |
3723582 | Winstead | Mar 1973 | |
3876741 | Klein | Apr 1975 | |
3883624 | McKenzie et al. | May 1975 | |
4091967 | Kinoshita | May 1978 | |
4136142 | Hargreaves et al. | Jan 1979 | |
4246211 | Kuhnel | Jan 1981 | |
4254068 | Otsuka | Mar 1981 | |
4255372 | Kuhnel et al. | Mar 1981 | |
4360486 | Dibiasi et al. | Nov 1982 | |
4448737 | Johnson | May 1984 | |
4772636 | Sakata et al. | Sep 1988 | |
4923654 | Freeland | May 1990 |
Number | Date | Country |
---|---|---|
50-107084 | Aug 1975 | JPX |
884896 | Dec 1961 | GBX |
Entry |
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Article entitled "Germany to Implement Tough Recycling Law," Plastics News (Apr. 29, 1991). |
Promotional literature from Arco Chemical Company--Beaver Valley Plant involving polystyrene foam. |
Modern Plastics Encyclopedia, vol. 49, No. 10A (1972-1973), pp. 97-98, 271-272, 296, and 314-315. |