Number | Name | Date | Kind |
---|---|---|---|
3234123 | Hinde | Feb 1966 | |
3701727 | Kormanik | Oct 1972 | |
4479876 | Fuchs | Oct 1984 | |
4867883 | Daigger et al | Sep 1989 | |
4917805 | Reid | Apr 1990 | |
5096577 | Ngo et al. | Mar 1992 | |
5196111 | Nicol et al. | Mar 1993 | |
5256281 | Ngo et al. | Oct 1993 | |
5338452 | Pidaparti | Aug 1994 | |
5342522 | Marsman et al. | Aug 1994 | |
5400549 | Morgan | Mar 1995 | |
5421999 | Poole et al. | Jun 1995 | |
5534141 | McAnaney et al. | Jul 1996 |
Entry |
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Lemna Corporation, "Floating Modular Cover Systems", published prior to Apr. 9, 1997. |
"If you think natural treatment systems are limited in scope . . . It's time to look at a Lemna.RTM. System," 1992. |