| Number | Date | Country | Kind |
|---|---|---|---|
| 01 01571 | Feb 2001 | FR |
| Number | Name | Date | Kind |
|---|---|---|---|
| 1546219 | Enzer et al. | Jul 1925 | A |
| 2294257 | Udvarhely et al. | Aug 1942 | A |
| 2825085 | Ingraham | Mar 1958 | A |
| 2951489 | Roberts | Sep 1960 | A |
| 3613697 | Andrews | Oct 1971 | A |
| 3760820 | Seidler | Sep 1973 | A |
| 4308879 | Thornbloom | Jan 1982 | A |
| 5611361 | Leone | Mar 1997 | A |
| 5941254 | Heler | Aug 1999 | A |
| 6002651 | Baccaray | Dec 1999 | A |
| 6073634 | Gueret | Jun 2000 | A |
| 6309124 | Gueret | Oct 2001 | B1 |
| 20010032656 | Kingsford et al. | Oct 2001 | A1 |
| Number | Date | Country |
|---|---|---|
| 0 261 750 | Mar 1988 | EP |
| 0 960 582 | Dec 1999 | EP |
| 1 020 135 | Jul 2000 | EP |
| 1 118 286 | Jul 2001 | EP |
| 1 020 647 | Feb 1953 | FR |
| 2 759 872 | Aug 1998 | FR |
| 2 139 886 | Nov 1984 | GB |
| Entry |
|---|
| English language Derwent Abstract of EP 0 960 582, Dec. 1, 1999. |