Number | Date | Country | Kind |
---|---|---|---|
8702356 | Jun 1987 | SEX |
Number | Name | Date | Kind |
---|---|---|---|
4055515 | Kirch | Oct 1977 | |
4085059 | Smith et al. | Apr 1978 | |
4120810 | Palmer | Oct 1978 | |
4276186 | Bakos et al. | Jun 1981 | |
4428871 | Ward et al. | Jan 1984 | |
4744834 | Haq | May 1988 | |
4812255 | Swoala | Mar 1989 | |
4828569 | Heath et al. | May 1989 | |
4836950 | Madsen et al. | Jun 1989 |
Entry |
---|
"NMP. N-Methyl-2-Pyrrolidone, Handbook", GAF Corporation, International Operations, New York, U.S.A. (1972). |