Number | Name | Date | Kind |
---|---|---|---|
3676770 | Sharaf et al. | Jul 1972 | |
3873911 | Champlin | Mar 1975 | |
3909708 | Champlin | Sep 1975 | |
3984768 | Staples | Oct 1976 | |
4697134 | Burkum et al. | Sep 1987 | |
4816768 | Champlin | Mar 1989 | |
4825170 | Champlin | Apr 1989 | |
4881038 | Champlin | Nov 1989 | |
4912416 | Champlin | Mar 1990 | |
5047722 | Wurst et al. | Sep 1991 | |
5140269 | Champlin | Aug 1992 | |
5343380 | Champlin | Aug 1994 |
Number | Date | Country |
---|---|---|
WO9322666 | Nov 1993 | EPX |
Entry |
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