Number | Name | Date | Kind |
---|---|---|---|
4664657 | Williamitis et al. | May 1987 | |
4675020 | McPhee | Jun 1987 | |
4806430 | Spielvogel et al. | Feb 1989 | |
4838876 | Wong et al. | Jun 1989 | |
4844986 | Karakelle et al. | Jul 1989 | |
4925668 | Kahn et al. | May 1990 | |
5061738 | Solomon et al. | Oct 1991 |
Number | Date | Country |
---|---|---|
0380102A1 | Jan 1990 | EPX |
0465037A1 | Aug 1991 | EPX |
0494648A2 | Jan 1992 | EPX |
Entry |
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"Ozone Treaty Tightened, CFC Substitutes Controlled," Chemical and Engineering News, p. 5, (Dec. 7, 1992). |