Number | Date | Country | Kind |
---|---|---|---|
2-295427 | Nov 1990 | JPX | |
2-304535 | Nov 1990 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3202705 | Powell | Aug 1965 | |
4772749 | Karrenbauer | Sep 1988 |
Number | Date | Country |
---|---|---|
0324210 | Jul 1989 | EPX |
0377430 | Jul 1990 | EPX |
1290212 | Mar 1962 | FRX |
868926 | May 1961 | GBX |
Entry |
---|
Patent Abstracts of Japan, vol. 13, No. 315 (C-619)(3663), Jul. 18, 1989, & JP-A-01 102 033, Kimiaki Matsuda, "Removal of Organic Acid". |