Number | Name | Date | Kind |
---|---|---|---|
3925200 | Izumi | Dec 1975 | |
3926790 | Izumi | Dec 1975 | |
3926791 | Izumi | Dec 1975 | |
3933633 | Saitoh | Jan 1976 | |
3941688 | Saitoh | Mar 1976 | |
4040949 | Saitoh | Aug 1977 | |
4046677 | Saitoh | Sep 1977 | |
4119533 | Saitoh | Oct 1978 | |
4617111 | Grimm | Oct 1986 | |
5120768 | Sisson | Jun 1992 |
Number | Date | Country |
---|---|---|
1444831 | Aug 1976 | GBX |
Entry |
---|
Sisson et al; "Selective Surfactant (Froth) Flotation of Plastics"--Davos Recycle '92, Int'l Forum and Expo., Davos, Switzerland, Apr. 7-10, 1992. |