Number | Name | Date | Kind |
---|---|---|---|
3081487 | Heffner et al. | Mar 1963 | |
3247295 | Burwell | Apr 1966 | |
3323273 | Lee et al. | Jun 1967 | |
3529320 | Kerns et al. | Sep 1970 | |
3616493 | Okubo et al. | Nov 1971 | |
3677681 | Zippel et al. | Jul 1972 | |
3916023 | Porter et al. | Oct 1975 | |
4390337 | Gately | Jun 1983 |
Entry |
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Buist, J. M., Edt., "Developments in Polyurethane-1", London, Applied Science Publishers Ltd., .COPYRGT.1978, pp. 68, 69. |