Number | Date | Country | Kind |
---|---|---|---|
2257431 | Nov 1972 | DT |
Number | Name | Date | Kind |
---|---|---|---|
2224837 | Rosenthal et al. | Dec 1940 | |
2500755 | Jones | Mar 1950 | |
2879171 | Kullenberg | Mar 1959 | |
3070557 | Gessler et al. | Dec 1962 | |
3364168 | Gessler et al. | Jan 1968 | |
3420915 | Braithwaite | Jan 1969 |
Entry |
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Boundy et al., Styrene Its Polymers, Copolymers & Derivatives, 1952, Reinhold Pub. Corp., New York, pp. 825, 832-833, 839-842. |